Convoy UGS-7A sailed on the morning of 14 April 1943, and the special Task Group joined up off New York and continued in company until 08:00 on 21 April, when the Group left the convoy and dropped astern 25 nautical miles , proceeding as straggler-with-escorts, although the escorts remained far enough astern so that they would not be visible to an enemy submarine sighting Big Horn.