 Complete the following phrase:  Convoy GP55 was assembled in mid-June 1943 as one of at least 69 convoys that sailed from Sydney to Brisbane during 1943. It comprised ten cargo ships and three U.S. Navy Landing Ships, Tank LST, and was escorted by the Bathurst-class corvettes which embarked the convoys senior officer, , , and . After departing Sydney at 8.45 am on 15 June the convoy maneuvered into five columns, with three ships in each of the centre columns and two in those at the edges. The escorts surrounded the convoy, with four sailing ahead of it and Deloraine to the stern. RAAF Anson and Beaufort aircraft also patrolled over the convoy at all times. U.S. Army transport Portmar, which had been badly damaged in the 