EXHIBIT 10.02
===============================================================================


                               GUARANTEE AGREEMENT

                                 BY AND BETWEEN

                                TOWER GROUP, INC.

                                       AND

                            WILMINGTON TRUST COMPANY

                          DATED AS OF DECEMBER 15, 2004


===============================================================================







                                TABLE OF CONTENTS

                                                                                                               Page

                                                                                                             
ARTICLE I          DEFINITIONS AND INTERPRETATION.................................................................1

    Section 1.1       Definitions and Interpretation..............................................................1

ARTICLE II         POWERS, DUTIES AND RIGHTS OF THE GUARANTEE TRUSTEE.............................................5

    Section 2.1       Powers and Duties of the Guarantee Trustee..................................................5
    Section 2.2       Certain Rights of the Guarantee Trustee.....................................................6
    Section 2.3       Not Responsible for Recitals or Issuance of Guarantee.......................................8
    Section 2.4       Events of Default; Waiver...................................................................8
    Section 2.5       Events of Default; Notice...................................................................8

ARTICLE III        GUARANTEE TRUSTEE..............................................................................9

    Section 3.1       Guarantee Trustee; Eligibility..............................................................9
    Section 3.2       Appointment, Removal and Resignation of the Guarantee Trustee...............................9

ARTICLE IV         GUARANTEE.....................................................................................10

    Section 4.1       Guarantee..................................................................................10
    Section 4.2       Waiver of Notice and Demand................................................................10
    Section 4.3       Obligations Not Affected...................................................................10
    Section 4.4       Rights of Holders..........................................................................11
    Section 4.5       Guarantee of Payment.......................................................................12
    Section 4.6       Subrogation................................................................................12
    Section 4.7       Independent Obligations....................................................................12
    Section 4.8       Enforcement by a Beneficiary...............................................................12

ARTICLE V          LIMITATION OF TRANSACTIONS; SUBORDINATION.....................................................13

    Section 5.1       Limitation of Transactions.................................................................13
    Section 5.2       Ranking....................................................................................13

ARTICLE VI         TERMINATION...................................................................................14

    Section 6.1       Termination................................................................................14

ARTICLE VII        INDEMNIFICATION...............................................................................14

    Section 7.1       Exculpation................................................................................14
    Section 7.2       Indemnification............................................................................15
    Section 7.3       Compensation; Reimbursement of Expenses....................................................16

                                       i






                                                                                                              
ARTICLE VIII       MISCELLANEOUS.................................................................................16

    Section 8.1       Successors and Assigns.....................................................................16
    Section 8.2       Amendments.................................................................................16
    Section 8.3       Notices....................................................................................17
    Section 8.4       Benefit....................................................................................17
    Section 8.5       Governing Law..............................................................................17
    Section 8.6       Counterparts...............................................................................18
    Section 8.7       Separability...............................................................................18




                                       ii



                               GUARANTEE AGREEMENT


                 This  GUARANTEE  AGREEMENT  (this  "Guarantee"),  dated  as  of
December 15, 2004,  is executed and  delivered by Tower Group,  Inc., a Delaware
corporation (the "Guarantor"),  and Wilmington Trust Company, a Delaware banking
corporation,  as  trustee  (the  "Guarantee  Trustee"),  for the  benefit of the
Holders (as defined  herein)  from time to time of the  Capital  Securities  (as
defined herein) of Tower Group  Statutory Trust III, a Delaware  statutory trust
(the "Issuer").

         WHEREAS,  pursuant to an Amended and Restated Declaration of Trust (the
"Declaration"),  dated as of the date hereof among Wilmington Trust Company, not
in  its  individual   capacity  but  solely  as   institutional   trustee,   the
administrators of the Issuer named therein,  the Guarantor,  as sponsor, and the
holders from time to time of undivided beneficial interests in the assets of the
Issuer,  the Issuer is issuing on the date  hereof  those  undivided  beneficial
interests,  having an aggregate  liquidation amount of $13,000,000 (the "Capital
Securities"); and

         WHEREAS,   as  incentive  for  the  Holders  to  purchase  the  Capital
Securities,  the Guarantor desires  irrevocably and unconditionally to agree, to
the  extent  set  forth in this  Guarantee,  to pay to the  Holders  of  Capital
Securities the Guarantee  Payments (as defined herein) and to make certain other
payments on the terms and conditions set forth herein;

         NOW, THEREFORE,  in consideration of the purchase by each Holder of the
Capital Securities, which purchase the Guarantor hereby agrees shall benefit the
Guarantor, the Guarantor executes and delivers this Guarantee for the benefit of
the Holders.

                                   ARTICLE I.

                         DEFINITIONS AND INTERPRETATION

SECTION 1.1       DEFINITIONS AND INTERPRETATION.

         In this Guarantee, unless the context otherwise requires:

      (a)  capitalized  terms  used in this  Guarantee  but not  defined  in the
preamble  above have the  respective  meanings  assigned to them in this Section
1.1;

      (b) a term  defined  anywhere  in  this  Guarantee  has the  same  meaning
throughout;

      (c) all  references  to "the  Guarantee" or "this  Guarantee"  are to this
Guarantee as modified, supplemented or amended from time to time;

      (d) all  references in this  Guarantee to "Articles" or "Sections"  are to
Articles or Sections of this Guarantee, unless otherwise specified;

      (e) terms defined in the  Declaration  as at the date of execution of this
Guarantee have the same meanings when used in this Guarantee,  unless  otherwise
defined in this Guarantee or unless the context otherwise requires; and



      (f) a reference to the singular includes the plural and vice versa.

         "AFFILIATE"  has the same  meaning as given to that term in Rule 405 of
the Securities Act of 1933, as amended, or any successor rule thereunder.

         "BENEFICIARIES"  means any  Person to whom the  Issuer is or  hereafter
becomes indebted or liable.

         "CAPITAL  SECURITIES" has the meaning set forth in the recitals to this
Guarantee.

         "COMMON SECURITIES" means the common securities issued by the Issuer to
the Guarantor pursuant to the Declaration.

         "CORPORATE  TRUST OFFICE" means the office of the Guarantee  Trustee at
which the  corporate  trust  business of the  Guarantee  Trustee  shall,  at any
particular  time,  be  principally  administered,  which  office  at the date of
execution of this Guarantee is located at Rodney Square North, 1100 North Market
Street,   Wilmington,   Delaware   19890-1600,    Attention:   Corporate   Trust
Administration.

         "COVERED PERSON" means any Holder of Capital Securities.

         "DEBENTURES" means the debt securities of the Guarantor  designated the
Fixed/Floating Rate Junior Subordinated  Deferrable Interest Debentures due 2034
held by the Institutional Trustee (as defined in the Declaration) of the Issuer.

         "DECLARATION  EVENT OF DEFAULT"  means an "Event of Default" as defined
in the Declaration.

         "EVENT OF DEFAULT" has the meaning set forth in Section 2.4(a).

         "GUARANTEE  PAYMENTS"  means the following  payments or  distributions,
without duplication,  with respect to the Capital Securities,  to the extent not
paid or made by the Issuer: (i) any accrued and unpaid Distributions (as defined
in the Declaration)  which are required to be paid on such Capital Securities to
the extent the Issuer  shall have funds  available  therefor,  (ii) the Optional
Redemption  Price to the extent the Issuer has funds  available  therefor,  with
respect to any Capital Securities called for redemption by the Issuer, (iii) the
Special Redemption Price to the extent the Issuer has funds available  therefor,
with respect to Capital  Securities  redeemed  upon the  occurrence of a Special
Event,  and (iv)  upon a  voluntary  or  involuntary  liquidation,  dissolution,
winding-up  or  termination  of the Issuer  (other than in  connection  with the
distribution of Debentures to the Holders of the Capital  Securities in exchange
therefor as provided in the Declaration), the lesser of (a) the aggregate of the
liquidation  amount and all  accrued  and unpaid  Distributions  on the  Capital
Securities  to the date of  payment,  to the extent the Issuer  shall have funds
available  therefor,  and (b) the  amount  of  assets  of the  Issuer  remaining
available for  distribution  to Holders in  liquidation of the Issuer (in either
case, the "Liquidation Distribution").

                                       2



         "GUARANTEE  TRUSTEE" means Wilmington Trust Company,  until a Successor
Guarantee Trustee has been appointed and has accepted such appointment  pursuant
to the  terms  of this  Guarantee  and  thereafter  means  each  such  Successor
Guarantee Trustee.

         "GUARANTOR" means  Tower  Group,  Inc. and  each of its successors  and
assigns.

         "HOLDER"  means any holder,  as  registered on the books and records of
the Issuer, of any Capital Securities;  PROVIDED,  HOWEVER, that, in determining
whether the Holders of the requisite percentage of Capital Securities have given
any request, notice, consent or waiver hereunder, "Holder" shall not include the
Guarantor or any Affiliate of the Guarantor.

         "INDEMNIFIED  PERSON" means the Guarantee Trustee, any Affiliate of the
Guarantee Trustee, or any officers, directors, shareholders,  members, partners,
employees,  representatives,  nominees,  custodians  or agents of the  Guarantee
Trustee.

         "INDENTURE" means the Indenture dated as of the date hereof between the
Guarantor and  Wilmington  Trust  Company,  not in its  individual  capacity but
solely as trustee, and any indenture  supplemental thereto pursuant to which the
Debentures are to be issued to the institutional trustee of the Issuer.

         "ISSUER"  has the meaning set forth in the  opening  paragraph  to this
Guarantee.

         "LIQUIDATION  DISTRIBUTION" has the meaning set forth in the definition
of "Guarantee Payments" herein.

         "MAJORITY  IN  LIQUIDATION  AMOUNT  OF THE  CAPITAL  SECURITIES"  means
Holder(s) of outstanding  Capital  Securities,  voting together as a class,  but
separately  from the  holders  of  Common  Securities,  of more  than 50% of the
aggregate  liquidation amount (including the stated amount that would be paid on
redemption,  liquidation or otherwise,  plus accrued and unpaid Distributions to
the date upon  which the  voting  percentages  are  determined)  of all  Capital
Securities then outstanding.

         "OBLIGATIONS"  means  any  costs,  expenses  or  liabilities  (but  not
including  liabilities related to taxes) of the Issuer other than obligations of
the  Issuer to pay to  holders  of any Trust  Securities  the  amounts  due such
holders pursuant to the terms of the Trust Securities.

         "OFFICER'S   CERTIFICATE"   means,   with  respect  to  any  Person,  a
certificate  signed by one  Authorized  Officer of such  Person.  Any  Officer's
Certificate  delivered  with respect to compliance  with a condition or covenant
provided for in this Guarantee shall include:

            (a) a statement that the officer  signing the Officer's  Certificate
      has read the covenant or condition and the definitions relating thereto;

            (b) a brief  statement of the nature and scope of the examination or
      investigation  undertaken  by  the  officer  in  rendering  the  Officer's
      Certificate;
                                       3


            (c) a  statement  that the  officer  has made  such  examination  or
      investigation as, in such officer's  opinion,  is necessary to enable such
      officer to express an informed  opinion as to whether or not such covenant
      or condition has been complied with; and

            (d) a statement as to whether,  in the opinion of the officer,  such
      condition or covenant has been complied with.

         "OPTIONAL REDEMPTION PRICE" has the meaning set forth in the Indenture.

         "PERSON" means a legal person,  including any individual,  corporation,
estate, partnership,  joint venture,  association,  joint stock company, limited
liability  company,  trust,  unincorporated  association,  or  government or any
agency or political subdivision thereof, or any other entity of whatever nature.

         "RESPONSIBLE OFFICER" means, with respect to the Guarantee Trustee, any
officer within the Corporate Trust Office of the Guarantee Trustee including any
Vice President, Assistant Vice President,  Secretary, Assistant Secretary or any
other officer of the Guarantee Trustee customarily  performing functions similar
to those  performed  by any of the above  designated  officers  and  also,  with
respect to a particular  corporate trust matter,  any other officer to whom such
matter is referred  because of that officer's  knowledge of and familiarity with
the particular subject.

         "SPECIAL EVENT" has the meaning set forth in the Indenture.

         "SPECIAL REDEMPTION PRICE" has the meaning set forth in the Indenture.

         "SUBSIDIARY"  means with respect to any Person,  (i) any corporation at
least a majority of the outstanding voting stock of which is owned,  directly or
indirectly,  by such  Person or by one or more of its  Subsidiaries,  or by such
Person and one or more of its Subsidiaries,  (ii) any general partnership, joint
venture or similar entity, at least a majority of the outstanding partnership or
similar  interests of which shall at the time be owned by such Person, or by one
or  more  of  its  Subsidiaries,  or by  such  Person  and  one or  more  of its
Subsidiaries  and (iii) any limited  partnership  of which such Person or any of
its  Subsidiaries  is a general  partner.  For the purposes of this  definition,
"voting stock" means shares,  interests,  participations or other equivalents in
the equity interest  (however  designated) in such Person having ordinary voting
power for the election of a majority of the  directors  (or the  equivalent)  of
such Person, other than shares,  interests,  participations or other equivalents
having such power only by reason of the occurrence of a contingency.

         "SUCCESSOR  GUARANTEE  TRUSTEE"  means a  successor  Guarantee  Trustee
possessing the qualifications to act as Guarantee Trustee under Section 3.1.

         "TRUST  SECURITIES"  means  the  Common  Securities  and   the  Capital
Securities.

                                       4



                                   ARTICLE II

                        POWERS, DUTIES AND RIGHTS OF THE
                                GUARANTEE TRUSTEE

      SECTION 2.1. POWERS AND DUTIES OF THE GUARANTEE TRUSTEE.

      (a) This Guarantee shall be held by the Guarantee  Trustee for the benefit
of the Holders of the Capital  Securities,  and the Guarantee  Trustee shall not
transfer  this  Guarantee  to any Person  except a Holder of Capital  Securities
exercising  his or her  rights  pursuant  to  Section  4.4(b) or to a  Successor
Guarantee  Trustee on  acceptance  by such  Successor  Guarantee  Trustee of its
appointment to act as Successor Guarantee Trustee. The right, title and interest
of the Guarantee  Trustee shall  automatically  vest in any Successor  Guarantee
Trustee,  and such vesting and cessation of title shall be effective  whether or
not  conveyancing  documents  have been executed and  delivered  pursuant to the
appointment of such Successor Guarantee Trustee.

      (b) If an Event of Default actually known to a Responsible  Officer of the
Guarantee  Trustee has occurred and is continuing,  the Guarantee  Trustee shall
enforce this Guarantee for the benefit of the Holders of the Capital Securities.

      (c) The Guarantee  Trustee,  before the occurrence of any Event of Default
and after the curing or waiving of all Events of Default that may have occurred,
shall  undertake  to perform only such duties as are  specifically  set forth in
this  Guarantee,  and no  implied  covenants  shall be read into this  Guarantee
against the Guarantee  Trustee.  In case an Event of Default has occurred  (that
has not been cured or waived pursuant to Section 2.4) and is actually known to a
Responsible  Officer of the  Guarantee  Trustee,  the  Guarantee  Trustee  shall
exercise such of the rights and powers vested in it by this  Guarantee,  and use
the same degree of care and skill in its exercise  thereof,  as a prudent person
would exercise or use under the  circumstances  in the conduct of his or her own
affairs.

      (d) No  provision  of this  Guarantee  shall be  construed  to relieve the
Guarantee Trustee from liability for its own negligent action, its own negligent
failure to act, or its own willful misconduct, except that:

            (i) prior to the  occurrence  of any Event of Default  and after the
      curing or waiving of all such Events of Default that may have occurred:

                  (A) the duties and obligations of the Guarantee  Trustee shall
            be determined  solely by the express  provisions of this  Guarantee,
            and  the  Guarantee  Trustee  shall  not be  liable  except  for the
            performance of such duties and obligations as are  specifically  set
            forth in this  Guarantee,  and no implied  covenants or  obligations
            shall be read into this Guarantee against the Guarantee Trustee; and

                  (B) in the  absence of bad faith on the part of the  Guarantee
            Trustee,  the  Guarantee  Trustee may  conclusively  rely, as to the
            truth  of  the  statements  and  the  correctness  of  the  opinions
            expressed  therein,  upon any certificates or opinions  furnished to
            the Guarantee  Trustee and  conforming to the  requirements  of this
            Guarantee; but in the case of any such certificates or opinions that
            by any provision hereof are specifically required to be furnished to
            the Guarantee  Trustee,  the Guarantee Trustee shall be under a duty
            to examine the same to determine  whether or not they conform to the
            requirements of this Guarantee;

                                        5


            (ii) the  Guarantee  Trustee  shall not be  liable  for any error of
      judgment  made in good faith by a  Responsible  Officer  of the  Guarantee
      Trustee,  unless it shall be proved that such  Responsible  Officer of the
      Guarantee  Trustee or the Guarantee  Trustee was negligent in ascertaining
      the pertinent facts upon which such judgment was made;

            (iii) the Guarantee  Trustee shall not be liable with respect to any
      action taken or omitted to be taken by it in good faith in accordance with
      the  written  direction  of the  Holders  of not less than a  Majority  in
      liquidation amount of the Capital Securities  relating to the time, method
      and place of conducting  any  proceeding  for any remedy  available to the
      Guarantee  Trustee,  or  relating  to the  exercise  of any trust or power
      conferred upon the Guarantee Trustee under this Guarantee; and

            (iv) no  provision of this  Guarantee  shall  require the  Guarantee
      Trustee  to  expend  or risk its own  funds or  otherwise  incur  personal
      financial  liability  in the  performance  of any of its  duties or in the
      exercise of any of its rights or powers,  if the  Guarantee  Trustee shall
      have reasonable  grounds for believing that the repayment of such funds is
      not reasonably assured to it under the terms of this Guarantee or security
      and indemnity,  reasonably satisfactory to the Guarantee Trustee,  against
      such risk or liability is not reasonably assured to it.

      SECTION 2.2 CERTAIN RIGHTS OF THE GUARANTEE TRUSTEE.

      (a) Subject to the provisions of Section 2.1:

            (i) The Guarantee Trustee may conclusively  rely, and shall be fully
      protected  in acting or  refraining  from  acting  upon,  any  resolution,
      certificate,  statement,  instrument,  opinion,  report, notice,  request,
      direction,  consent,  order,  bond,  debenture,  note,  other  evidence of
      indebtedness  or other paper or document  believed by it to be genuine and
      to have been signed, sent or presented by the proper party or parties.

            (ii) Any  direction  or act of the  Guarantor  contemplated  by this
      Guarantee shall be sufficiently evidenced by an Officer's Certificate.

            (iii)  Whenever,  in  the  administration  of  this  Guarantee,  the
      Guarantee  Trustee  shall  deem it  desirable  that a matter  be proved or
      established before taking, suffering or omitting any action hereunder, the
      Guarantee   Trustee   (unless  other   evidence  is  herein   specifically
      prescribed)  may,  in the  absence of bad faith on its part,  request  and
      conclusively  rely upon an Officer's  Certificate of the Guarantor  which,
      upon  receipt  of  such  request,  shall  be  promptly  delivered  by  the
      Guarantor.

            (iv)  The  Guarantee  Trustee  shall  have  no  duty  to  see to any
      recording,  filing or registration of any instrument (or any re-recording,
      refiling or re-registration thereof).

                                       6


            (v) The Guarantee Trustee may consult with counsel of its selection,
      and the advice or opinion of such counsel  with  respect to legal  matters
      shall be full and complete  authorization and protection in respect of any
      action  taken,  suffered or omitted by it  hereunder  in good faith and in
      accordance with such advice or opinion. Such counsel may be counsel to the
      Guarantor or any of its  Affiliates  and may include any of its employees.
      The  Guarantee   Trustee  shall  have  the  right  at  any  time  to  seek
      instructions  concerning  the  administration  of this  Guarantee from any
      court of competent jurisdiction.

            (vi) The Guarantee  Trustee shall be under no obligation to exercise
      any of the rights or powers vested in it by this  Guarantee at the request
      or direction of any Holder,  unless such Holder shall have provided to the
      Guarantee Trustee such security and indemnity,  reasonably satisfactory to
      the Guarantee Trustee,  against the costs,  expenses (including attorneys'
      fees and  expenses  and the expenses of the  Guarantee  Trustee's  agents,
      nominees or custodians)  and  liabilities  that might be incurred by it in
      complying  with such  request  or  direction,  including  such  reasonable
      advances as may be requested by the Guarantee Trustee; PROVIDED,  HOWEVER,
      that  nothing  contained  in this  Section  2.2(a)(vi)  shall  relieve the
      Guarantee  Trustee,  upon the  occurrence  of an Event of Default,  of its
      obligation  to  exercise  the  rights  and  powers  vested  in it by  this
      Guarantee.

            (vii)  The  Guarantee  Trustee  shall  not  be  bound  to  make  any
      investigation  into  the  facts  or  matters  stated  in  any  resolution,
      certificate,  statement,  instrument,  opinion,  report, notice,  request,
      direction,  consent,  order,  bond,  debenture,  note,  other  evidence of
      indebtedness or other paper or document, but the Guarantee Trustee, in its
      discretion, may make such further inquiry or investigation into such facts
      or matters as it may see fit.

            (viii) The Guarantee Trustee may execute any of the trusts or powers
      hereunder or perform any duties hereunder either directly or by or through
      agents, nominees, custodians or attorneys, and the Guarantee Trustee shall
      not be  responsible  for any  misconduct  or negligence on the part of any
      agent or attorney appointed with due care by it hereunder.

            (ix)  Any  action  taken  by the  Guarantee  Trustee  or its  agents
      hereunder  shall  bind the  Holders  of the  Capital  Securities,  and the
      signature of the Guarantee Trustee or its agents alone shall be sufficient
      and effective to perform any such action. No third party shall be required
      to inquire as to the authority of the Guarantee Trustee to so act or as to
      its  compliance  with any of the terms and  provisions of this  Guarantee,
      both of which shall be conclusively  evidenced by the Guarantee  Trustee's
      or its agent's taking such action.

            (x) Whenever in the  administration  of this Guarantee the Guarantee
      Trustee  shall deem it desirable to receive  instructions  with respect to
      enforcing  any remedy or right or taking any other action  hereunder,  the
      Guarantee  Trustee  (i) may  request  instructions  from the  Holders of a
      Majority in liquidation amount of the Capital Securities, (ii) may refrain
      from enforcing such remedy or right or taking such other action until such
      instructions  are received,  and (iii) shall be protected in  conclusively
      relying on or acting in accordance with such instructions.

                                       7


            (xi) The Guarantee Trustee shall not be liable for any action taken,
      suffered,  or omitted to be taken by it in good faith, without negligence,
      and reasonably believed by it to be authorized or within the discretion or
      rights or powers conferred upon it by this Guarantee.

      (b) No provision of this  Guarantee  shall be deemed to impose any duty or
obligation on the  Guarantee  Trustee to perform any act or acts or exercise any
right, power, duty or obligation conferred or imposed on it, in any jurisdiction
in which it  shall  be  illegal  or in  which  the  Guarantee  Trustee  shall be
unqualified or incompetent in accordance with applicable law to perform any such
act or acts or to  exercise  any  such  right,  power,  duty or  obligation.  No
permissive  power or  authority  available  to the  Guarantee  Trustee  shall be
construed to be a duty.

      SECTION 2.3 NOT RESPONSIBLE FOR RECITALS OR ISSUANCE OF GUARANTEE.

      The recitals  contained in this Guarantee shall be taken as the statements
of the Guarantor,  and the Guarantee Trustee does not assume any  responsibility
for their  correctness.  The Guarantee Trustee makes no representation as to the
validity or sufficiency of this Guarantee.

      SECTION 2.4 EVENTS OF DEFAULT; WAIVER.

      (a) An Event of Default under this  Guarantee  will occur upon the failure
of the Guarantor to perform any of its payment or other obligations hereunder.

      (b) The  Holders  of a  Majority  in  liquidation  amount  of the  Capital
Securities may, voting or consenting as a class, on behalf of the Holders of all
of the Capital Securities, waive any past Event of Default and its consequences.
Upon such waiver,  any such Event of Default shall cease to exist,  and shall be
deemed to have been  cured,  for every  purpose of this  Guarantee,  but no such
waiver shall extend to any  subsequent  or other  default or Event of Default or
impair any right consequent thereon.

      SECTION 2.5 EVENTS OF DEFAULT; NOTICE.

      (a) The Guarantee Trustee shall, within 90 days after the occurrence of an
Event of Default,  transmit by mail, first class postage prepaid, to the Holders
of the Capital  Securities and the  Guarantor,  notices of all Events of Default
actually known to a Responsible  Officer of the Guarantee  Trustee,  unless such
defaults  have been cured before the giving of such notice,  PROVIDED,  HOWEVER,
that the Guarantee  Trustee shall be protected in withholding such notice if and
so long  as a  Responsible  Officer  of the  Guarantee  Trustee  in  good  faith
determines  that the  withholding  of such  notice  is in the  interests  of the
Holders of the Capital Securities.

      (b) The  Guarantee  Trustee  shall not be deemed to have  knowledge of any
Event of Default unless the Guarantee Trustee shall have received written notice
from the Guarantor or a Holder of the Capital  Securities (except in the case of
a payment  default),  or a Responsible  Officer of the Guarantee Trustee charged
with the  administration  of this Guarantee shall have obtained actual knowledge
thereof.

                                       8


                                  ARTICLE III

                                GUARANTEE TRUSTEE

      SECTION 3.1 GUARANTEE TRUSTEE; ELIGIBILITY.

      (a) There shall at all times be a Guarantee Trustee which shall:

                  (i) not be an Affiliate of the Guarantor, and

                  (ii)  be  a  banking   corporation  or  national   association
            organized and doing  business under the laws of the United States of
            America  or any State or  Territory  thereof or of the  District  of
            Columbia, or Person authorized under such laws to exercise corporate
            trust  powers,  having a combined  capital  and  surplus of at least
            fifty million U.S. dollars ($50,000,000), and subject to supervision
            or  examination  by  Federal,  State,  Territorial  or  District  of
            Columbia  authority.  If such  corporation  or national  association
            publishes reports of condition at least annually, pursuant to law or
            to  the  requirements  of the  supervising  or  examining  authority
            referred  to  above,   then,   for  the  purposes  of  this  Section
            3.1(a)(ii),  the combined capital and surplus of such corporation or
            national  association shall be deemed to be its combined capital and
            surplus  as set  forth in its most  recent  report of  condition  so
            published.

      (b) If at any time the Guarantee  Trustee shall cease to be eligible to so
act under Section 3.1(a),  the Guarantee Trustee shall immediately resign in the
manner and with the effect set forth in Section 3.2(c).

      (c)  If the  Guarantee  Trustee  has or  shall  acquire  any  "conflicting
interest"  within the meaning of Section 310(b) of the Trust  Indenture Act, the
Guarantee  Trustee shall either  eliminate such interest or resign to the extent
and in the manner provided by, and subject to this Guarantee.

SECTION 3.2 APPOINTMENT, REMOVAL AND RESIGNATION OF THE GUARANTEE TRUSTEE.

      (a) Subject to Section 3.2(b),  the Guarantee  Trustee may be appointed or
removed  without  cause at any time by the  Guarantor  except during an Event of
Default.

      (b) The Guarantee  Trustee shall not be removed in accordance with Section
3.2(a) until a Successor  Guarantee  Trustee has been appointed and has accepted
such  appointment by written  instrument  executed by such  Successor  Guarantee
Trustee and delivered to the Guarantor.

      (c) The  Guarantee  Trustee  appointed to office shall hold office until a
Successor  Guarantee  Trustee shall have been  appointed or until its removal or
resignation.  The  Guarantee  Trustee may resign from office  (without  need for
prior or subsequent  accounting)  by an  instrument  in writing  executed by the
Guarantee  Trustee and delivered to the Guarantor,  which  resignation shall not
take effect  until a Successor  Guarantee  Trustee  has been  appointed  and has
accepted such appointment by an instrument in writing executed by such Successor
Guarantee  Trustee and delivered to the  Guarantor  and the resigning  Guarantee
Trustee.

                                       9


      (d) If no  Successor  Guarantee  Trustee  shall  have been  appointed  and
accepted  appointment  as  provided  in this  Section  3.2  within 60 days after
delivery of an  instrument  of removal or  resignation,  the  Guarantee  Trustee
resigning or being removed may petition any court of competent  jurisdiction for
appointment of a Successor  Guarantee Trustee.  Such court may thereupon,  after
prescribing  such  notice,  if any, as it may deem  proper,  appoint a Successor
Guarantee Trustee.

      (e) No Guarantee  Trustee shall be liable for the acts or omissions to act
of any Successor Guarantee Trustee.

      (f) Upon  termination  of this  Guarantee or removal or resignation of the
Guarantee  Trustee  pursuant to this Section 3.2, the Guarantor shall pay to the
Guarantee  Trustee all amounts owing to the Guarantee Trustee under Sections 7.2
and 7.3 accrued to the date of such termination, removal or resignation.

                                   ARTICLE IV

                                    GUARANTEE

      SECTION 4.1 GUARANTEE.

      (a) The Guarantor irrevocably and unconditionally agrees to pay in full to
the Holders the Guarantee Payments (without  duplication of amounts  theretofore
paid by the  Issuer),  as and when due,  regardless  of any defense  (except the
defense of payment by the  Issuer),  right of set-off or  counterclaim  that the
Issuer  may have or  assert.  The  Guarantor's  obligation  to make a  Guarantee
Payment  may be  satisfied  by direct  payment  of the  required  amounts by the
Guarantor  to the  Holders or by causing  the Issuer to pay such  amounts to the
Holders.

      (b) The Guarantor  hereby also agrees to assume any and all Obligations of
the Issuer and in the event any such  Obligation  is not so assumed,  subject to
the  terms  and  conditions   hereof,   the  Guarantor  hereby  irrevocably  and
unconditionally  guarantees to each  Beneficiary  the full payment,  when and as
due,  of any and  all  Obligations  to such  Beneficiaries.  This  Guarantee  is
intended  to be  for  the  benefit  of,  and  to be  enforceable  by,  all  such
Beneficiaries, whether or not such Beneficiaries have received notice hereof.

      SECTION 4.2 WAIVER OF NOTICE AND DEMAND.

      The Guarantor  hereby waives notice of acceptance of this Guarantee and of
any liability to which it applies or may apply, presentment, demand for payment,
any right to require a proceeding  first  against the Issuer or any other Person
before proceeding against the Guarantor,  protest, notice of nonpayment,  notice
of dishonor, notice of redemption and all other notices and demands.

      SECTION 4.3 OBLIGATIONS NOT AFFECTED.

         The  obligations,  covenants,  agreements  and duties of the  Guarantor
under this  Guarantee  shall in no way be  affected or impaired by reason of the
happening from time to time of any of the following:

                                       10


      (a) the  release or  waiver,  by  operation  of law or  otherwise,  of the
performance  or  observance  by the Issuer of any express or implied  agreement,
covenant,  term or condition  relating to the Capital Securities to be performed
or observed by the Issuer;

      (b) the  extension  of time for the  payment  by the  Issuer of all or any
portion of the  Distributions,  Optional  Redemption Price,  Special  Redemption
Price, Liquidation Distribution or any other sums payable under the terms of the
Capital  Securities  or the extension of time for the  performance  of any other
obligation under,  arising out of or in connection with, the Capital  Securities
(other  than an  extension  of  time  for  payment  of  Distributions,  Optional
Redemption Price,  Special Redemption Price,  Liquidation  Distribution or other
sum payable that results from the  extension of any interest  payment  period on
the Debentures or any extension of the maturity date of the Debentures permitted
by the Indenture);

      (c) any failure,  omission,  delay or lack of diligence on the part of the
Holders to enforce,  assert or exercise  any right,  privilege,  power or remedy
conferred on the Holders pursuant to the terms of the Capital Securities, or any
action on the part of the Issuer granting indulgence or extension of any kind;

      (d) the voluntary or  involuntary  liquidation,  dissolution,  sale of any
collateral, receivership,  insolvency, bankruptcy, assignment for the benefit of
creditors, reorganization,  arrangement, composition or readjustment of debt of,
or other similar proceedings  affecting,  the Issuer or any of the assets of the
Issuer;

      (e) any invalidity of, or defect or deficiency in, the Capital Securities;

      (f) the  settlement or compromise of any obligation  guaranteed  hereby or
hereby incurred; or

      (g) any other  circumstance  whatsoever that might otherwise  constitute a
legal or equitable  discharge or defense of a guarantor,  it being the intent of
this  Section  4.3 that the  obligations  of the  Guarantor  hereunder  shall be
absolute and unconditional under any and all circumstances.

         There  shall be no  obligation  of the  Holders  to give  notice to, or
obtain  consent of, the  Guarantor  with respect to the  happening of any of the
foregoing.

      SECTION 4.4 RIGHTS OF HOLDERS.

      (a) The  Holders  of a  Majority  in  liquidation  amount  of the  Capital
Securities have the right to direct the time, method and place of conducting any
proceeding for any remedy available to the Guarantee  Trustee in respect of this
Guarantee  or to direct the  exercise of any trust or power  conferred  upon the
Guarantee  Trustee under this  Guarantee;  PROVIDED,  HOWEVER,  that (subject to
Section 2.1) the Guarantee Trustee shall have the right to decline to follow any
such direction if the Guarantee Trustee being advised by counsel determines that
the  action  or  proceeding  so  directed  may not  lawfully  be taken or if the
Guarantee Trustee in good faith by its board of directors or trustees, executive
committees  or a trust  committee of directors  or trustees  and/or  Responsible
Officers  shall  determine  that the action or  proceedings  so  directed  would
involve the Guarantee Trustee in personal liability.

      (b) Any Holder of Capital  Securities  may  institute  a legal  proceeding
directly  against the Guarantor to enforce the Guarantee  Trustee's rights under
this Guarantee, without first instituting a legal proceeding against the Issuer,
the  Guarantee  Trustee or any other Person.  The Guarantor  waives any right or
remedy to require that any such action be brought first against the Issuer,  the
Guarantee Trustee or any other Person before so proceeding  directly against the
Guarantor.

                                       11


      SECTION 4.5 GUARANTEE OF PAYMENT.

      This Guarantee creates a guarantee of payment and not of collection.

      SECTION 4.6 SUBROGATION.

      The Guarantor shall be subrogated to all (if any) rights of the Holders of
Capital  Securities  against the Issuer in respect of any  amounts  paid to such
Holders by the  Guarantor  under this  Guarantee;  PROVIDED,  however,  that the
Guarantor shall not (except to the extent  required by applicable  provisions of
law) be entitled to enforce or exercise  any right that it may acquire by way of
subrogation or any indemnity,  reimbursement or other agreement, in all cases as
a result of payment  under this  Guarantee,  if, after giving effect to any such
payment,  any amounts  are due and unpaid  under this  Guarantee.  If any amount
shall be paid to the  Guarantor  in  violation of the  preceding  sentence,  the
Guarantor  agrees to hold such  amount in trust for the  Holders and to pay over
such amount to the Holders.

      SECTION 4.7 INDEPENDENT OBLIGATIONS.

      The Guarantor  acknowledges that its obligations hereunder are independent
of the obligations of the Issuer with respect to the Capital Securities and that
the  Guarantor  shall be liable as  principal  and as debtor  hereunder  to make
Guarantee Payments pursuant to the terms of this Guarantee  notwithstanding  the
occurrence of any event referred to in subsections  (a) through (g),  inclusive,
of Section 4.3 hereof.

      SECTION 4.8 ENFORCEMENT BY A BENEFICIARY.

      A Beneficiary  may enforce the  obligations of the Guarantor  contained in
Section 4.1(b) directly against the Guarantor and the Guarantor waives any right
or remedy to require that any action be brought  against the Issuer or any other
person or entity before proceeding against the Guarantor. The Guarantor shall be
subrogated  to all  rights  (if any) of any  Beneficiary  against  the Issuer in
respect of any amounts paid to the  Beneficiaries  by the  Guarantor  under this
Guarantee; PROVIDED, HOWEVER, that the Guarantor shall not (except to the extent
required by mandatory  provisions of law) be entitled to enforce or exercise any
rights that it may acquire by way of subrogation or any indemnity, reimbursement
or other agreement, in all cases as a result of payment under this Guarantee, if
at the time of any such payment,  and after giving  effect to such payment,  any
amounts are due and unpaid under this Guarantee.


                                       12


                                   ARTICLE V

                    LIMITATION OF TRANSACTIONS; SUBORDINATION

      SECTION 5.1 LIMITATION OF TRANSACTIONS.

      So long as any Capital Securities remain  outstanding,  if (a) there shall
have occurred and be  continuing  an Event of Default or a Declaration  Event of
Default or (b) the Guarantor shall have selected an Extension Period as provided
in the  Declaration  and such  period,  or any  extension  thereof,  shall  have
commenced and be continuing,  then the Guarantor  shall not and shall not permit
any Affiliate of the Guarantor controlled by the Guarantor to (x) declare or pay
any  dividends or  distributions  on, or redeem,  purchase,  acquire,  or make a
liquidation  payment with respect to, any of the Guarantor's or such Affiliate's
capital  stock  (other  than  payments  of  dividends  or  distributions  to the
Guarantor or a Subsidiary of the Guarantor) or make any guarantee  payments with
respect to the foregoing; or (y) make any payment of principal of or interest or
premium,  if any, on or repay,  repurchase or redeem any debt  securities of the
Guarantor or any  Affiliate of the Guarantor  controlled  by the Guarantor  that
rank PARI PASSU in all  respects  with or junior in interest  to the  Debentures
(other  than,  with  respect to  clauses  (x) and (y)  above,  (i)  repurchases,
redemptions or other acquisitions of shares of capital stock of the Guarantor or
any  Subsidiary  of the Guarantor in connection  with any  employment  contract,
benefit plan or other similar arrangement with or for the benefit of one or more
employees,  officers,  directors or  consultants,  in connection with a dividend
reinvestment  or  stockholder  stock  purchase  plan or in  connection  with the
issuance of capital stock of the Guarantor or of such  Subsidiary (or securities
convertible  into or exercisable for such capital stock) as  consideration in an
acquisition  transaction  entered into prior to the  occurrence  of the Event of
Default,  Declaration Event of Default or Extension Period, as applicable,  (ii)
as a  result  of any  exchange  or  conversion  of any  class or  series  of the
Guarantor's  capital  stock  (or  any  capital  stock  of a  Subsidiary  of  the
Guarantor) for any class or series of the  Guarantor's  capital stock (or in the
case of a Subsidiary of the Guarantor,  any class or series of such Subsidiary's
capital stock) or of any class or series of the Guarantor's indebtedness for any
class or series of the Guarantor's capital stock (or in the case of indebtedness
of a Subsidiary of the  Guarantor,  of any class or series of such  Subsidiary's
indebtedness for any class or series of such Subsidiary's  capital stock), (iii)
the purchase of fractional  interests in shares of the Guarantor's capital stock
(or  the  capital  stock  of a  Subsidiary  of the  Guarantor)  pursuant  to the
conversion or exchange  provisions  of such capital stock or the security  being
converted or exchanged,  (iv) any  declaration of a dividend in connection  with
any  stockholders'  rights  plan,  or the  issuance  of  rights,  stock or other
property under any stockholders' rights plan, or the redemption or repurchase of
rights  pursuant  thereto,  (v) any  dividend  in the form of  stock,  warrants,
options or other  rights  where the dividend  stock or the stock  issuable  upon
exercise of such warrants,  options or other rights is the same stock as that on
which the  dividend  is being  paid or ranks  PARI  PASSU with or junior to such
stock and any cash  payments in lieu of  fractional  shares issued in connection
therewith, or (vi) payments under this Guarantee).

      SECTION 5.2 RANKING.

      This  Guarantee will  constitute an unsecured  obligation of the Guarantor
and will rank  subordinate  and junior in right of payment  to all  present  and
future Senior  Indebtedness (as defined in the Indenture) of the Guarantor.  The
Guarantor's  obligations in respect of this Guarantee shall rank pari passu with
the Guarantor's obligations under (i) the Guarantee Agreement by and between the
Guarantor and U.S. Bank National Association,  dated as of May 15, 2003 and (ii)
the  Guarantor's  obligations  under the Guarantee  Agreement by and between the
Guarantor  and JP Morgan Chase Bank,  dated as of September  30, 2003.  By their
acceptance  thereof,  each Holder of Capital  Securities agrees to the foregoing
provisions of this Guarantee and the other terms set forth herein.

                                       13


      The right of the Guarantor to participate in any distribution of assets of
any of its Subsidiaries upon any such Subsidiary's liquidation or reorganization
or otherwise  is subject to the prior  claims of  creditors of that  Subsidiary,
except to the extent the  Guarantor  may itself be  recognized  as a creditor of
that Subsidiary.  Accordingly,  the Guarantor's obligations under this Guarantee
will be effectively  subordinated to all existing and future  liabilities of the
Guarantor's  Subsidiaries,  and claimants  should look only to the assets of the
Guarantor for payments  hereunder.  This Guarantee does not limit the incurrence
or issuance  of other  secured or  unsecured  debt of the  Guarantor,  including
Senior Indebtedness of the Guarantor, under any indenture that the Guarantor may
enter into in the future or otherwise.

                                   ARTICLE VI

                                   TERMINATION

      SECTION 6.1 TERMINATION.

      This Guarantee shall terminate as to the Capital  Securities (i) upon full
payment of the  Optional  Redemption  Price or Special  Redemption  Price of all
Capital  Securities then  outstanding,  (ii) upon the distribution of all of the
Debentures  to the Holders of all of the Capital  Securities  or (iii) upon full
payment  of  the  amounts  payable  in  accordance  with  the  Declaration  upon
dissolution of the Issuer.  This Guarantee will continue to be effective or will
be  reinstated,  as the  case  may be,  if at any time  any  Holder  of  Capital
Securities must restore payment of any sums paid under the Capital Securities or
under this Guarantee.

                                  ARTICLE VII

                                 INDEMNIFICATION

SECTION 7.1 EXCULPATION.

      (a) No Indemnified  Person shall be liable,  responsible or accountable in
damages or otherwise to the Guarantor or any Covered Person for any loss, damage
or claim incurred by reason of any act or omission  performed or omitted by such
Indemnified  Person in good faith in  accordance  with this  Guarantee  and in a
manner that such Indemnified  Person reasonably  believed to be within the scope
of the authority  conferred on such  Indemnified  Person by this Guarantee or by
law, except that an Indemnified Person shall be liable for any such loss, damage
or claim incurred by reason of such Indemnified  Person's  negligence or willful
misconduct with respect to such acts or omissions.


                                       14


      (b) An  Indemnified  Person  shall be fully  protected  in relying in good
faith upon the records of the Issuer or the Guarantor and upon such information,
opinions,  reports or statements presented to the Issuer or the Guarantor by any
Person as to matters the Indemnified Person reasonably  believes are within such
other Person's  professional  or expert  competence and who, if selected by such
Indemnified  Person,  has been selected with reasonable care by such Indemnified
Person, including information,  opinions,  reports or statements as to the value
and amount of the  assets,  liabilities,  profits,  losses,  or any other  facts
pertinent  to the  existence  and amount of assets from which  Distributions  to
Holders of Capital Securities might properly be paid.

      SECTION 7.2 INDEMNIFICATION.

      (a) The Guarantor agrees to indemnify each Indemnified  Person for, and to
hold each  Indemnified  Person harmless  against,  any and all loss,  liability,
damage,  claim or expense incurred without  negligence or willful  misconduct on
the part of the  Indemnified  Person,  arising out of or in connection  with the
acceptance or administration of the trust or trusts  hereunder,  including,  but
not  limited to, the costs and  expenses  (including  reasonable  legal fees and
expenses) of the Indemnified Person defending itself against,  or investigating,
any claim or liability in connection  with the exercise or performance of any of
the Indemnified Person's powers or duties hereunder. The obligation to indemnify
as set forth in this Section 7.2 shall survive the resignation or removal of the
Guarantee Trustee and the termination of this Guarantee.

      (b) Promptly after receipt by an Indemnified Person under this Section 7.2
of notice of the commencement of any action,  such Indemnified Person will, if a
claim in respect  thereof is to be made against the Guarantor under this Section
7.2,  notify  the  Guarantor  in writing of the  commencement  thereof;  but the
failure so to notify the  Guarantor  (i) will not  relieve  the  Guarantor  from
liability  under paragraph (a) above unless and to the extent that the Guarantor
did  not  otherwise  learn  of such  action  and  such  failure  results  in the
forfeiture  by the  Guarantor of  substantial  rights and defenses and (ii) will
not, in any event, relieve the Guarantor from any obligations to any Indemnified
Person  other than the  indemnification  obligation  provided in  paragraph  (a)
above.  The Guarantor  shall be entitled to appoint  counsel of the  Guarantor's
choice at the  Guarantor's  expense to represent the  Indemnified  Person in any
action for which  indemnification  is sought (in which case the Guarantor  shall
not thereafter be responsible for the fees and expenses of any separate  counsel
retained  by the  Indemnified  Person or  Persons  except  as set forth  below);
PROVIDED,  HOWEVER,  that such counsel shall be REASONABLY  satisfactory  to the
Indemnified Person.  Notwithstanding the Guarantor's election to appoint counsel
to represent the Guarantor in an action,  the Indemnified  Person shall have the
right to employ separate counsel  (including  local counsel),  and the Guarantor
shall bear the reasonable  fees,  costs and expenses of such separate counsel if
(i) the use of counsel  chosen by the  Guarantor  to represent  the  Indemnified
Person would  present such counsel with a conflict of interest,  (ii) the actual
or  potential  defendants  in, or targets of, any such action  include  both the
Indemnified  Person and the  Guarantor  and the  Indemnified  Person  shall have
reasonably  concluded  that there may be legal  defenses  available to it and/or
other  Indemnified  Person(s)  which are  different  from or additional to those
available to the Guarantor,  (iii) the Guarantor shall not have employed counsel
satisfactory  to the  Indemnified  Person to represent  the  Indemnified  Person
within a reasonable  time after notice of the institution of such action or (iv)
the Guarantor shall authorize the Indemnified  Person to employ separate counsel
at the  expense of the  Guarantor.  The  Guarantor  will not,  without the prior
written consent of the Indemnified  Persons,  settle or compromise or consent to
the entry of any  judgment  with  respect to any  pending or  threatened  claim,
action,  suit or proceeding in respect of which  indemnification or contribution
may be sought  hereunder  (whether or not the Indemnified  Persons are actual or
potential parties to such claim or action) unless such settlement, compromise or
consent  includes an unconditional  release of each Indemnified  Person from all
liability arising out of such claim, action, suit or proceeding.


                                       15


      SECTION 7.3 COMPENSATION; REIMBURSEMENT OF EXPENSES.

      The Guarantor agrees:

      (a) to pay to the  Guarantee  Trustee from time to time such  compensation
for all services  rendered by it  hereunder  as the parties  shall agree to from
time to time (which compensation shall not be limited by any provision of law in
regard to the compensation of a trustee of an express trust); and

      (b) except as  otherwise  expressly  provided  herein,  to  reimburse  the
Guarantee  Trustee upon request for all reasonable  expenses,  disbursements and
advances  incurred  or made  by it in  accordance  with  any  provision  of this
Guarantee   (including  the  reasonable   compensation   and  the  expenses  and
disbursements of its agents and counsel), except any such expense,  disbursement
or advance as may be attributable to its negligence or willful misconduct.

      The  provisions  of this  Section  7.3 shall  survive the  resignation  or
removal of the Guarantee Trustee and the termination of this Guarantee.

                                  ARTICLE VIII

                                  MISCELLANEOUS

      SECTION 8.1 SUCCESSORS AND ASSIGNS.

      All guarantees and agreements  contained in this Guarantee  shall bind the
successors,  assigns,  receivers,  trustees and representatives of the Guarantor
and shall inure to the benefit of the  Holders of the  Capital  Securities  then
outstanding.  Except  in  connection  with any  merger or  consolidation  of the
Guarantor  with or into  another  entity or any sale,  transfer  or lease of the
Guarantor's  assets to another  entity,  in each case,  to the extent  permitted
under the  Indenture,  the  Guarantor  may not assign its rights or delegate its
obligations under this Guarantee without the prior approval of the Holders of at
least a Majority in liquidation amount of the Capital Securities.

      SECTION 8.2 AMENDMENTS.

      Except with respect to any changes that do not adversely affect the rights
of Holders of the Capital  Securities in any material  respect (in which case no
consent of Holders will be  required),  this  Guarantee may be amended only with
the prior  approval of the  Holders of not less than a Majority  in  liquidation
amount of the  Capital  Securities  and the  Guarantor.  The  provisions  of the
Declaration  with  respect  to  amendments  thereof  apply to the giving of such
approval.


                                       16


      SECTION 8.3 NOTICES.

      All notices  provided  for in this  Guarantee  shall be in  writing,  duly
signed by the party giving such notice,  and shall be  delivered,  telecopied or
mailed by first class mail, as follows:

      (a) If given to the Guarantee Trustee,  at the Guarantee Trustee's mailing
address set forth below (or such other address as the Guarantee Trustee may give
notice of to the Holders of the Capital Securities and the Guarantor):

                  Wilmington Trust Company
                  Rodney Square North
                  1100 North Market Street
                  Wilmington, Delaware 19890-1600
                  Attention: Corporate Trust Administration
                  Telecopy:  302-636-4140


      (b) If given to the  Guarantor,  at the  Guarantor's  mailing  address set
forth below (or such other  address as the  Guarantor  may give notice of to the
Holders of the Capital Securities and to the Guarantee Trustee):

                  Tower Group, Inc.
                  120 Broadway, 14th Floor
                  New York, New York 10271
                  Attention:  Francis M. Colalucci
                  Telecopy:  212-271-5492

      (c) If given to any Holder of the Capital  Securities,  at the address set
forth on the books and records of the Issuer.

         All such  notices  shall be deemed to have been given when  received in
person,  telecopied  with  receipt  confirmed,  or mailed by first  class  mail,
postage  prepaid,  except that if a notice or other document is refused delivery
or cannot be  delivered  because  of a changed  address  of which no notice  was
given,  such notice or other  document shall be deemed to have been delivered on
the date of such refusal or inability to deliver.

      SECTION 8.4 BENEFIT.

         This  Guarantee  is solely for the  benefit of the  Beneficiaries  and,
subject to Section  2.1(a),  is not  separately  transferable  from the  Capital
Securities.

      SECTION 8.5 GOVERNING LAW.

         PURSUANT TO SECTION 5-1401 OF THE GENERAL  OBLIGATIONS LAW OF THE STATE
OF NEW YORK,  THIS GUARANTEE SHALL BE GOVERNED BY, AND CONSTRUED AND INTERPRETED
IN ACCORDANCE WITH, THE LAW OF THE STATE OF NEW YORK.


                                       17


SECTION 8.6       COUNTERPARTS.

         This  Guarantee  may be executed in one or more  counterparts,  each of
which shall be an original, but all of which taken together shall constitute one
and the same instrument.

      SECTION 8.7 SEPARABILITY.

      In case one or more of the provisions  contained in this  Guarantee  shall
for any reason be held to be invalid,  illegal or  unenforceable in any respect,
such  invalidity,  illegality  or  unenforceability  shall not  affect any other
provisions of this  Guarantee,  but this Guarantee shall be construed as if such
invalid or illegal or unenforceable provision had never been contained herein.

                     SIGNATURES APPEAR ON THE FOLLOWING PAGE



                                       18





         THIS GUARANTEE is executed as of the day and year first above written.



                  Tower Group, Inc., as Guarantor

                  By:        /s/  Michael H. Lee
                           ------------------------------------------
                           Name:     Michael H. Lee
                           Title:       President and CEO



                  WILMINGTON TRUST COMPANY, as Guarantee Trustee

                  By:         /s/  C. Slaybaugh
                           ------------------------------------------
                           Name:     Christopher J. Slaybaugh
                           Title:       Financial Services Officer






                                       19