B7's first convoys, in the spring of 1942, were uneventful and as the Battle of the Atlantic increased in intensity in the summer and autumn, the group's charges were escorted without loss.

[3] B7's new SOE was Commander Peter Gretton, of HMS Duncan, a tough and capable leader, who quickly molded the group to his own image.

In a week-long battle against wolfpacks, Star, Amstel and later Fink, Convoy ONS 5 lost 13 ships, for the destruction of six U-boats and the disabling of seven.

A series of uneventful convoys followed, as the U-boat Arm withdrew from the North Atlantic after Black May, while Gretton lobbied for a chance for B7 to operate as a Support Group.

[5] B7 returned to escort duty on the North Atlantic route, continuing without major incident until the group was disbanded in the summer of 1944 as part of the preparations for Operation Neptune, the naval contribution to the Normandy invasion.