Exhibit 8
                                February 23, 1996



F&M National Corporation                             FB&T Financial Corporation
38 Rouss Avenue                                      4117 Chain Bridge road
Post Office Box 2800                                 P.O. Box 1087
Winchester, Virginia 22604                           Fairfax, Virginia 22030


                   Opinion With Respect to Certain Tax Matters
                              Relating to Merger of
                           FB&T Financial Corporation
                                      into
                            F&M National Corporation

Gentlemen:

         You have  requested  our  opinion  as to  certain  federal  income  tax
consequences  of the proposed merger of FB&T Financial  Corporation,  a Virginia
corporation  ("FB&T"),  with and  into  F&M  National  Corporation,  a  Virginia
corporation ("F&M") pursuant to an Agreement and Plan of Reorganization dated as
of November 22, 1995 (the "Agreement") by and between F&M and FB&T.

                                   The Merger

         Pursuant to the Agreement and the Plan of Merger (the "Plan")  attached
as Exhibit A to the Agreement, and subject to various regulatory approvals, FB&T
will be merged with and into F&M in accordance  with the provisions of, and with
the effect provided in, the Virginia Stock Corporation Act (the "Merger").  As a
result of the Merger, F&M will become the parent holding company of Fairfax Bank
& Trust Company,  the banking  subsidiary of FB&T ("Fairfax  Bank"),  as well as
F&M's  current  subsidiary  banks,  all of which will  continue to conduct their
businesses in substantially the same manner as prior to the Merger.

         At the  effective  date of the Merger,  and pursuant to the Plan,  each
share of common stock of FB&T ("FB&T  Common  Stock") will be exchanged  for and
converted into that number of shares of common stock of F&M ("F&M Common Stock")
having an aggregate  market value equal to $35.00,  plus cash in lieu of issuing
fractional shares of F&M Common Stock.

                                 Our Examination

         In connection  with the  preparation of this opinion,  we have examined
such documents concerning the Merger as we have deemed necessary.  We have based
our  conclusions  on the  Internal  Revenue  Code of 1986 (the  "Code")  and the
regulations  promulgated pursuant thereto, each as amended from time to time and
in effect as of the date hereof, as well as existing judicial and administrative
interpretations thereof.

         As to various questions of fact material to our opinion, we have relied
upon  the  representations  made in the  Agreement  as  well  as the  additional
representations set forth below. In particular, we have assumed that there is no
plan or intention on the part of the  shareholders  of FB&T to sell or otherwise
dispose of the F&M Common Stock  received by them in the Merger which would have
the effect set forth in paragraph B of the "Additional Representations" below.

                           Additional Representations

         In  connection  with the  proposed  Merger,  the  following  additional
representations  have been made to and relied upon by us in the  preparation  of
this opinion:

         A.  The  fair  market  value  of F&M  Common  Stock  received  by  FB&T
shareholders will be approximately equal to the fair market value of FB&T Common
Stock to be surrendered in exchange  therefor,  and the exchange ratio used such
exchange is the result of arm's length negotiations.

         B. To the best knowledge of the management of FB&T, there is no plan or
intention on the part of FB&T's shareholders to sell or otherwise dispose of F&M
Common Stock  received by them in the Merger that will reduce their  holdings of
F&M Common  Stock to a number of shares  having in the  aggregate  a fair market
value of less than 50 percent of the fair market value of all of the FB&T Common
Stock  held by FB&T  shareholders  on the  effective  date  of the  Merger.  For
purposes of this  representation,  shares of FB&T Common  Stock  surrendered  by
dissenters  or  exchanged  for cash in lieu of  fractional  shares of F&M Common
Stock will be treated as outstanding  FB&T Common Stock on the effective date of
the Merger.  In  addition,  shares of FB&T Common Stock and shares of F&M Common
Stock held by FB&T  shareholders  and otherwise sold,  redeemed,  or disposed of
prior  or   subsequent   to  the  Merger  will  be  considered  in  making  this
representation.

         C. F&M has no plan or intention to sell or otherwise  dispose of any of
the  assets  of  FB&T  to be  transferred  to  F&M  in the  Merger,  except  for
dispositions  made in the ordinary course of business or transfers  described in
Section 368(a)(2)(C).

         D.       Each party to the Merger will pay its own expenses, if any,
         incurred in connection with the Merger.

         E.       Following the Merger, F&M will continue the historic business
         of FB&T.

         F.       F&M has no plan or intention to redeem or reacquire any of its
         stock to be issued in the Merger.

         G. The  liabilities  of FB&T to be  assumed  by F&M as a result  of the
Merger and the  liabilities  to which FB&T's assets are subject were incurred in
the  ordinary  course  of  business  and are  associated  with the  assets to be
transferred in the Merger.

         H.       There is no intercorporate indebtedness existing between F&M
and FB&T that was issued, acquired or will be settled at a discount.

         I. The fair market value and adjusted basis of the assets of FB&T to be
transferred to F&M in the Merger will equal or exceed the sum of the liabilities
assumed  by F&M plus the  amount of  liabilities  to which the FB&T  assets  are
subject.

         J.       No dividends or other distributions will be made with respect
to any FB&T Common Stock immediately before the proposed Merger, except for
regular, normal distributions.

         K. None of the shares of F&M Common  Stock,  cash in lieu of fractional
shares or other property  received by any  shareholder-employee  in exchange for
FB&T  Common  Stock  pursuant  to  the  Merger  constitutes  or is  intended  as
compensation for services  rendered,  nor is considered  separate  consideration
for, or allocable  to, any  employment  agreement or  relationship.  None of the
compensation to be received by any shareholder-employee of FB&T will be separate
consideration  for, or  allocable  to, any of such  shareholder-employee's  FB&T
Common Stock. In addition, any compensation paid to any  shareholder-employee of
FB&T,   including   any   shares  of  F&M   Common   Stock   received   by  such
shareholder-employee  in  exchange  for and in  cancellation  of any  option  to
purchase  shares of FB&T Common Stock  existing as of the effective  date of the
Merger,  will constitute and be intended as compensation  for services  actually
rendered  and  bargained  for at arm's  length,  and will be  commensurate  with
amounts paid to third parties bargaining at arm's length for similar services.

         L. No two parties to the Merger are investment  companies as defined in
Section  368(a)((2)(F)(iii)  and (iv) of the Code, and for each of F&M and FB&T,
less than 50 percent of the fair  market  value of its total  assets  (excluding
cash,  cash items,  government  securities,  and stock and  securities in any 50
percent or greater subsidiary) consists of stock and securities.

         M.       FB&T is not under the jurisdiction of a court in a Title 11 or
similar case within the meaning of Section 368(a)(3)(A) of the Code.

         N. Cash paid to FB&T shareholders in lieu of issuing  fractional shares
of F&M Common  Stock will be paid  solely for the  purpose of saving the expense
and  administrative  inconvenience  of issuing  fractional  shares,  will not be
separately  bargained for  consideration  and will  represent  only a mechanical
rounding  off of the number of shares of F&M  Common  Stock to be issued to FB&T
shareholders.

                                   Tax Opinion

         Based upon the foregoing,  subject to the limitations expressed herein,
and with due regard to such legal considerations as we deem necessary, we are of
the opinion that for federal income tax purposes:

         1.       The Merger will constitute and qualify as a "reorganization"
within the meaning of Section 368(a)(1)(A) of the Code.

         2. No gain,  other  income or loss will be  recognized  by F&M (Section
1032 of the Code) or FB&T (Section 361 of the Code) as a result of the Merger.

         3. To the extent that  shareholders of FB&T receive F&M Common Stock in
exchange for their shares of FB&T Common Stock,  they will  recognize no gain or
loss as a result of the Merger. Section 354(a)(1) of the Code.

         4. A FB&T  shareholder who receives cash in lieu of a fractional  share
of F&M Common  Stock will be  treated as if the  fractional  share of F&M Common
Stock  had been  issued  and then  redeemed  by F&M.  If the  deemed  redemption
distribution is not  essentially  equivalent to a dividend within the meaning of
Section  302(b)(1)  of the Code,  then the FB&T  shareholder  will be treated as
receiving a distribution in redemption of such fractional share,  subject to the
provisions and limitations of Section 302 of the Code. If the deemed  redemption
distribution is essentially equivalent to a dividend,  then the FB&T shareholder
will be treated as receiving a dividend  distribution under Section 301(c)(1) of
the Code, as provided in Section  302(d) of the Code.  See Section  356(a)(2) of
the Code,  as  interpreted  by Clark v.  Commissioner,  489 U.S.  726 (1989) and
Revenue Ruling 66-365, 1966-2 C.B. 116.

         5. A dissenting  FB&T  shareholder who receives solely cash in exchange
for his FB&T  Common  Stock will be  treated  as  receiving  a  distribution  in
redemption of his FB&T Common Stock,  subject to the provisions and  limitations
of Section 302 of the Code. See Section 356(a)(2) of the Code, as interpreted by
Clark  v.  Commissioner,  489  U.S.  726  (1989).  Where,  as a  result  of such
distribution, a FB&T shareholder no longer holds any shares of FB&T Common Stock
directly and,  furthermore,  is not deemed to constructively own any such shares
pursuant  to  Section  318 of the Code,  the  distribution  will be treated as a
complete  termination  of such  shareholder's  interest  within  the  meaning of
Section  302(b)(3)  of the Code and will be  treated as a  distribution  in full
payment in exchange for the  shareholder's  shares pursuant to Section 302(a) of
the Code.

         6. The tax basis of F&M Common Stock received by FB&T  shareholders who
exchange  their FB&T Common  Stock for F&M Common  Stock will be the same as the
tax  basis of FB&T  Common  Stock  surrendered  in  exchange  therefor.  Section
358(a)(1) of the Code.

         7. The holding period of F&M Common Stock received by FB&T shareholders
will include the period during which FB&T Common Stock  surrendered  in exchange
therefor  was held by such FB&T  shareholders,  provided  the FB&T was held as a
capital asset on the date of the exchange.

         This opinion is based upon the  provisions of the Code, as  interpreted
by regulations,  administrative  rulings, and case law, in effect as of the date
hereof.

         This opinion is provided in  connection  with the Merger as required by
Section 5.1(e) of the Agreement, is solely for the benefit of F&M, FB&T and FB&T
shareholders,  and may not be relied  upon in any  other  manner or by any other
person.  This  opinion may not be  disclosed  to any other person or used in any
other manner without the prior written consent of the undersigned.

                                                   Very truly yours,

                                                   LECLAIR RYAN,

                                                   A Professional Corporation