As the Allies gained the upper hand in the Battle of the Atlantic throughout 1943 and 1944, attacks on convoys diminished and the amount of escort cover was reduced, but the hard work of planning and organizing convoys never ceased. By May 1944, British participation in convoy escorts was withdrawn entirely, and Canada was left with sole responsibility until September 1944. Murray's moment of singular pride came in this period, when the largest convoy of World War II, HX 300 sailed for the UK via New York on 17 July 1944, with 167 merchant ships (). It arrived in the UK, without incident, on 3 August 1944.