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                                                                Exhibit 5.1

                      [APPLEBY SPURLING & KEMPE LETTERHEAD]

                                                                June 20, 2001

Trenwick Group Ltd.
Continental Building
25 Church Street
Hamilton HM 12
Bermuda

Ladies and Gentlemen:

You have asked us to render this opinion in our capacity as your counsel as to
Bermuda law in connection with the registration under the Securities Act of
1933, as amended, of the United States of America (the "Securities Act"), of a
Registration Statement on Form S-3 and related documents (the "Registration
Statement") relating to the Company's common shares (the "Common Shares"),
preferred shares (the "Preferred Shares"), depositary shares (the "Depositary
Shares"), warrants to purchase Common Shares ("Common Share Warrants"), warrants
to purchase Preferred Shares ("Preferred Share Warrants"), share purchase
contracts ("Share Purchase Contracts") and share purchase units ("Share Purchase
Units"). The Common Shares, Preferred Shares, Depositary Shares, Common Share
Warrants, Preferred Share Warrants, Share Purchase Contracts and Share Purchase
Units, collectively, the "Securities".

For the purposes of this opinion we have examined and relied upon the
Registration Statement and the documents listed in the Schedule to this opinion.
The Registration Statement and the documents, collectively, the "Documents".

ASSUMPTIONS

In stating our opinion we have assumed:

(a)     the authenticity, accuracy and completeness of all Documents submitted
        to us as originals and the conformity to authentic original Documents of
        all Documents submitted to us as certified, conformed, notarized, faxed
        or photostatic copies;

(b)     the genuineness of all signatures on the Documents;

(c)     the authority, capacity and power of each of the persons signing the
        Documents (other than the Company);

(d)     that any representation, warranty or statement of fact or law, other
        than as to the laws of Bermuda, made in any of the Documents is true,
        accurate and complete;

(e)     that there are no provisions of the laws or regulations of any
        jurisdiction other than Bermuda which would have any implication in
        relation to the opinion expressed herein;





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(f)     that the records which were the subject of the Company Search were
        complete and accurate at the time of such search and disclosed all
        information which is material for the purposes of this opinion and such
        information has not since the date of the Company Search been materially
        altered;

(g)     that when executed and delivered the Registration Statement will be in a
        form which does not differ in any material respect from the draft which
        we have examined for the purposes of this opinion; and

(h)     that the Company has filed the Registration Statement in good faith for
        the purpose of carrying on its business and that, at the time it did so,
        there were reasonable grounds for believing that the activities
        contemplated by the Registration Statement would benefit the Company.

OPINION

Based upon and subject to the foregoing and subject to the reservations set out
below and to any matters not disclosed to us, we are of the opinion that:

1.      The Company is an exempted company incorporated with limited liability
        and existing under the laws of Bermuda.

2.      When duly authorised, issued, allotted and fully paid for, the Common
        Shares (including any Common Shares issuable pursuant to any Common
        Share Warrants, Share Purchase Contracts or Share Purchase Units) will
        be validly issued, fully paid, non-assessable shares of the Company.

3.      When duly authorised, issued, allotted and fully paid for, the Preferred
        Shares (including any Preferred Shares issuable pursuant to any
        Preferred Share Warrants, Share Purchase Contracts or Share Purchase
        Units or represented by Depositary Shares) will be validly issued, fully
        paid, non-assessable shares of the Company.

4.      When duly authorised, executed, delivered and paid for, and assuming
        compliance with and the validity of any governing contract, the
        Depositary Shares, the Common Share Warrants, the Preferred Shares
        Warrants, the Share Purchase Contracts and the Share Purchase Units will
        be validly authorised, executed, delivered and fully paid securities of
        the Company.

5.      The issue of the Securities will not violate, conflict with or
        constitute a default under (i) any requirement of any law or any
        regulation of Bermuda, or (ii) the Constitutional Documents as that term
        is defined in paragraph 3 of the Schedule to this opinion.

6.      There are no taxes, duties or other charges payable to or chargeable by
        the Government of Bermuda, or any authority or agency thereof, in
        respect of the issue of the Securities.

RESERVATIONS

We have the following reservations:





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(a)     We express no opinion as to any law other than Bermuda law and none of
        the opinions expressed herein relates to compliance with or matters
        governed by the laws of any jurisdiction except Bermuda. This opinion is
        limited to Bermuda law as applied by the Courts of Bermuda at the date
        hereof.

(b)     Any provision in the Registration Statement that certain calculations or
        certificates will be conclusive and binding will not be effective if
        such calculations or certificates are fraudulent or erroneous on their
        face and will not necessarily prevent juridical enquiries into the
        merits of any claim by an aggrieved party.

(c)     Any reference in this opinion to shares being "non-assessable" shall
        mean, in relation to fully-paid shares of the Company and subject to any
        contrary provision in any agreement in writing between such Company and
        the holder of shares, that no shareholder shall be obliged to contribute
        further amounts to the capital of the Company, either in order to
        complete payment for their shares, to satisfy claims of creditors of the
        Company, or otherwise; and no shareholder shall be bound by an
        alteration of the Memorandum of Association or Bye-Laws of the Company
        after the date on which he became a shareholder, if and so far as the
        alteration requires him to take, or subscribe for additional shares, or
        in any way increases his liability to contribute to the share capital
        of, or otherwise to pay money to, the Company.

(d)     Searches of the Register of Companies at the office of the Registrar of
        Companies are not conclusive and it should be noted that the Register of
        Companies does not reveal:

        (i)     details of matters which have been lodged for filing or
                registration which as a matter of general practice of the
                Registrar of Companies would have or should have been disclosed
                on the public file but have not actually been registered or to
                the extent that they have been registered have not been
                disclosed or do not appear in the public records at the date and
                time the search is concluded; or

        (ii)    details of matters which should have been lodged for
                registration but have not been lodged for registration at the
                date the search is concluded.

(e)     In order to issue this opinion we have carried out the Company Search as
        referred to in the Schedule to this opinion and have not enquired as to
        whether there has been any change since the date of such search.

DISCLOSURE

This opinion is addressed to you in connection with the filing by the Company of
the Registration Statement with the United States Securities and Exchange
Commission. We consent to the inclusion of this opinion as Exhibit 5.1 to the
Registration Statement and to the reference to our firm under the caption
"Enforcement of Civil Liabilities Under United States Federal Securities Laws"
in the prospectus included as part of the Registration Statement. This opinion
is not to be made available to, or relied upon, by any other person or entity,
or for any other purpose, without our prior written consent, except that this
opinion may be relied upon by Messrs. Baker & McKenzie in rendering its opinion
in connection with the filing by the






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Company of the Registration Statement with the United States Securities and
Exchange Commission, as referred to herein. In giving the foregoing consents, we
do not thereby admit that we come within the category of Persons whose consent
is required under Section 7 of the Securities Act of 1933, as amended, of the
United States, or the rules and regulations of the Securities and Exchange
Commission promulgated thereunder. Except as stated above, without our prior
written consent, this opinion may not be furnished or quoted to or relied upon
by any Person for any purpose.

Further, this opinion speaks as of its date and is strictly limited to the
matters stated herein and we assume no obligation to review or update this
opinion if applicable laws or the existing facts or circumstances should change.

This opinion is governed by and is to be construed in accordance with Bermuda
law. It is given on the basis that it will not give rise to any legal
proceedings with respect thereto in any jurisdiction other than Bermuda.

                             Yours faithfully,

                             /s/ Appleby Spurling & Kempe
                             ----------------------------
                             Appleby Spurling & Kempe


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                                    SCHEDULE

1.      A copy of the Registration Statement.

2.      The entries and filings shown in respect of the Company on the file of
        the Company maintained in the Register of Companies at office of the
        Registrar of Companies in Hamilton, Bermuda, as revealed by a search on
        20 June 2001 (the "Company Search").

3.      Originals of the Certificate of Incorporation, the Memorandum of
        Association, the Certificate of Incorporation on Change of Name and the
        revised Bye-laws (adopted 22 March 2000) for the Company (collectively,
        "the Constitutional Documents").