Exhibit 99.4 NINTH AMENDMENT TO THE HOLDINGS GUARANTY NINTH AMENDMENT TO THE HOLDINGS GUARANTY (the "Ninth Amendment"), dated as of March 28, 2003, among TRENWICK GROUP LTD., a company organized under the laws of Bermuda ("Holdings") and the Banks...Holdings Guaranty • April 11th, 2003 • Trenwick America Corp • Fire, marine & casualty insurance • New York
