Exhibit 32.1

                            CERTIFICATION PURSUANT TO
                             18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Trenwick America Corporation (the
"Company") on Form 10-Q for the period ending June 30, 2003 as filed with the
Securities and Exchange Commission on the date hereof (the "Report"), I, W.
Marston Becker, Acting Chief Executive Officer of the Company, certify, pursuant
to 18 U.S.C. ss. 1350, as adopted pursuant to ss.906 of the Sarbanes-Oxley Act
of 2002, that:

      (1) The Report fully complies with the requirements of Section 13(a) or
      15(d) of the Securities and Exchange Act of 1934; and

      (2) The information contained in the Report fairly represents, in all
      material respects, the financial condition and results of operations of
      the Company.

Date: August 22, 2003                                 /s/ W. Marston Becker
                                                      ---------------------
                                                          W. Marston Becker
                                             Acting Chief Executive Officer

A signed original of this written statement required by Section 906 has been
provided to Trenwick America Corporation and will be retained by Trenwick
America Corporation and furnished to the Securities and Exchange Commission or
its staff upon request.


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