 In January 1943, the squadron received three Grumman F4F Wildcat Mk.IVs, called the "Martlet" in British service, and on 21 February 1943 flew from RNAS Hatston to embark aboard the escort carrier to serve on convoy escort duty in the battle of the Atlantic.On 22 April "Biter" and the escort destroyers , , and joined convoy ONS-4 sailing from Liverpool.On 25 April a Swordfish from 811 Squadron attacked , which was then sunk by depth charges by "Pathfinder".