1 EXHIBIT 5.2 June 6, 1997 To Each of the Persons Listed on Schedule I Attached Hereto RE: TRENWICK CAPITAL TRUST I 8.82% Exchange Subordinated Capital Income Securities Ladies and Gentlemen: We have acted as special Delaware counsel for Trenwick Capital Trust I, a Delaware business trust (the "Trust") in connection with the issuance of its 8.82% Subordinated Income Capital Securities(TM) (SKIS(TM)) (the "Capital Securities") and common securities (the "Common Securities") in connection with the Amended and Restated Declaration of Trust (the "Declaration") entered into as of January 31, 1997, by and among Trenwick Group Inc., as Sponsor, Chase Manhattan Bank Delaware, as Delaware Trustee, The Chase Manhattan Bank, as Property Trustee, and the Administrative Trustees named therein. Initially capitalized terms used herein and not otherwise defined are used herein as defined in the Declaration. For purposes of giving the opinions hereinafter set forth, we have examined only the following documents and have conducted no independent factual investigations of our own: 1. The Certificate of Trust for the Trust, dated as of January 21, 1997 (the "Trust Certificate"), as filed in the Office of the Secretary of State of the State of Delaware (the "Secretary of State") on January 21, 1997; 2 2. The original declaration of trust of the Trust, dated as of January 21, 1997, by and between Trenwick Group Inc., as Sponsor and Chase Manhattan Bank Delaware, as Delaware Trustee (the "Original Declaration"); 3. The Declaration; 4. A Certificate of Good Standing for the Trust, dated June 6, 1997, obtained from the Secretary of State; and 5. The form of Registration Statement on Form S-4 to be filed on the date hereof (the "Registration Statement"), including a prospectus with respect to the Trust (the "Prospectus"), relating to, among other things, an Exchange Offer (the "Exchange Offer") involving the 8.82% Exchange Capital Securities of the Trust representing preferred, undivided beneficial interests in the assets of the Trust (each, an "Exchange Security" and collectively, the "Exchange Securities" to be offered in exchange for the presently outstanding 8.82% Subordinated Income Capital Securities(TM) (SKIS(TM)) of the Trust (the "Old Securities"), filed by the Sponsor and the Trust with the Securities and Exchange Commission. As to certain facts material to the opinions expressed herein, we have relied upon the representations and warranties contained in the documents examined by us all of which we have assumed to be true, complete and accurate in all material respects. The documents referred to in paragraphs 1, 2, 3 and 5 above are collectively referred to as the "Agreements." Based upon the foregoing, and upon an examination of such questions of law of the State of Delaware as we have considered necessary or appropriate, and subject to the assumptions, qualifications, limitations and exceptions set forth herein, we are of the opinion that: 1. The Trust has been duly created and is validly existing in good standing as a business trust under the Business Trust Act. 2. The Exchange Securities will represent valid, and, subject to the qualifications set forth in number 3 below, 3 fully paid and non-assessable undivided beneficial interests in the assets of the Trust. 3. The Holders of Exchange Securities, as beneficial owners of Exchange Securities of the Trust, will be entitled to the same limitation of personal liability extended to stockholders of private corporations for profit organized under the General Corporation Law of the State of Delaware, except that the Holders of Exchange Securities may be obligated to (a) provide indemnity and/or security in connection with and pay taxes or governmental charges arising from transfers or exchanges of certificates representing Exchange Securities and the issuance of replacement certificates representing Exchange Securities, (b) provide security or indemnity in connection with requests of or directions to the Property Trustee to exercise its rights and powers under the Declaration, and (c) provide indemnity in connection with violations of the Declaration or federal or state securities laws arising from transfers or exchanges of certificates representing Exchange Securities and the issuance of replacement certificates representing Exchange Securities. All of the foregoing opinions contained herein are subject to the following assumptions, qualifications, limitations and exceptions: a. The foregoing opinions are limited to the laws of the State of Delaware presently in effect, excluding the securities laws thereof. We have not considered and express no opinion on the laws of any other jurisdiction, including, without limitation, federal laws and rules and regulations relating thereto. b. We have assumed the due execution and delivery by each party listed as a party to each document examined by us. We have assumed further the due authorization by each party thereto (exclusive of the Trust) of each document examined by us, and that each of such parties (exclusive of the Trust) has the full corporate, or trust or banking, power, authority, and legal right to execute, deliver and perform each such document. We also have assumed that each of the parties to each of the Agreements (exclusive of the Trust and the Administrative Trustees) is a corporation, bank, national banking association or trust company, validly existing and in good standing under the laws of their respective jurisdictions 4 of organization and that the Agreements to which they are a party do not result in the breach of the terms of, and do not contravene their respective constituent documents, any contractual restriction binding on them or any law, rule or regulation applicable to them. In addition, we have assumed the legal capacity of any natural persons who are parties to any of the documents examined by us. c. We have assumed that all signatures on documents examined by us are genuine, that all documents submitted to us as originals are authentic and that all documents submitted to us as copies conform with the originals. d. We have assumed that the Original Declaration and the Declaration collectively, constitute the entire agreement among each of the respective parties thereto with respect to the subject matter thereof, including with respect to the creation, operation, dissolution and winding up of the Trust and that the Declaration and the Certificate are in full force and effect. e. We have assumed that no event set forth in Article 9 of the Declaration has occurred. f. We have assumed that the Exchange Securities will be issued and exchanged in accordance with the Declaration and the Prospectus. We have further assumed the receipt of each Person to whom a Exchange Security is to be issued by the Trust of a Certificate for such Exchange Security and the exchange by it of an equivalent liquidation amount of Old Securities in accordance with the Declaration and the Prospectus. g. We note that we have not participated in the preparation, and do not assume responsibility for the contents, of the Registration Statement or the Prospectus. We consent to the filing of this opinion with the Securities and Exchange Commission as an exhibit to the Registration Statement. In addition, we hereby consent to the use of our name under the heading "Validity of Exchange Securities" in the Prospectus. 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, or the rules and 5 regulations of the Securities and Exchange Commission thereunder. Very truly yours, /s/ Potter Anderson & Corroon -------------------------------- 259849 6 SCHEDULE I TRENWICK GROUP INC.