<ARTICLE> 7
<LEGEND>
This schedule contains summary financial information extracted from the
Financial Statements contained in the Form 10-Q for the six months ended June
30, 1997 for Trenwick Group Inc.
</LEGEND>
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               JUN-30-1997
<EXCHANGE-RATE>                                      1
<DEBT-HELD-FOR-SALE>                           790,075
<DEBT-CARRYING-VALUE>                                0
<DEBT-MARKET-VALUE>                                  0
<EQUITIES>                                      36,463
<MORTGAGE>                                           0
<REAL-ESTATE>                                        0
<TOTAL-INVEST>                                 826,538
<CASH>                                          10,012
<RECOVER-REINSURE>                              79,981
<DEFERRED-ACQUISITION>                          23,836
<TOTAL-ASSETS>                               1,038,016
<POLICY-LOSSES>                                496,062
<UNEARNED-PREMIUMS>                             83,374
<POLICY-OTHER>                                       0
<POLICY-HOLDER-FUNDS>                                0
<NOTES-PAYABLE>                                      0
<PREFERRED-MANDATORY>                          110,000
<PREFERRED>                                          0
<COMMON>                                         1,194
<OTHER-SE>                                     335,472
<TOTAL-LIABILITY-AND-EQUITY>                 1,038,016
<PREMIUMS>                                     101,019
<INVESTMENT-INCOME>                             23,852
<INVESTMENT-GAINS>                               1,916
<OTHER-INCOME>                                      10
<BENEFITS>                                      58,290
<UNDERWRITING-AMORTIZATION>                     31,957
<UNDERWRITING-OTHER>                            12,701
<INCOME-PRETAX>                                 23,849
<INCOME-TAX>                                     5,455
<INCOME-CONTINUING>                             18,394
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                  1,037
<CHANGES>                                            0
<NET-INCOME>                                    17,357
<EPS-PRIMARY>                                     1.50
<EPS-DILUTED>                                     1.45
<RESERVE-OPEN>                                       0
<PROVISION-CURRENT>                                  0
<PROVISION-PRIOR>                                    0
<PAYMENTS-CURRENT>                                   0
<PAYMENTS-PRIOR>                                     0
<RESERVE-CLOSE>                                      0
<CUMULATIVE-DEFICIENCY>                              0