Exhibit 1(a) FUND AMERICAN COMPANIES, INC. WHITE MOUNTAINS INSURANCE GROUP, LTD. UNDERWRITING AGREEMENTUnderwriting Agreement • May 22nd, 2003 • White Mountains Insurance Group LTD • Fire, marine & casualty insurance • New York
AS TRUSTEESupplemental Indenture • May 22nd, 2003 • White Mountains Insurance Group LTD • Fire, marine & casualty insurance
SENIOR INDENTURE Dated as of May 19, 2003 Providing for Issuance of Securities in Series CROSS-REFERENCE TABLESenior Indenture • May 22nd, 2003 • White Mountains Insurance Group LTD • Fire, marine & casualty insurance • New York
