In England, the 387th was assigned to the Eighth Air Force 3d Bomb Wing and stationed at RAF Chipping Ongar in Essex. The 387th was the fourth Marauder group to arrive in the UK. The Group began combat on 15 August 1943 by joining with three other B-26 groups attacking coastal defences on the French Coast near Boulogne, and was mounted in thick fog. While taking off, one of the B-26 Bombers crashed at the end of the main runway, killing all of the crew except the tail gunner. The group concentrated its attacks on airfields during the first months of operations. In common with other Marauder units of the 3d Bomb Wing, the 387th was transferred to Ninth Air Force on 16 October 1943.