"They Fought a German Convoy. 21 April 1943, Felixstowe. One Small Supply Ship Was Sunk and Another Probably Destroyed in One of the Longest and Most Persistent Attacks An Enemy Convoy Ever Launched by British Light Coastal Forces. the Attack Led by Lieut Ian C Trelawney, Rnvr, Took Place Off the Dutch Coast on the Night of 19 April 1943. It Lasted 2 and 1/2 Hours." Lieut Ian C Trelawney, RNVR who led the attack, with some members of the crews of our Light Coastal Forces.