 The bombing of Darwin (March 1942) and Townsville (July 1942), and the arrival of American troops in the north (from March 1942), added further impetus to the establishment of facilities in the area.When hostilities extended to Papua New Guinea in May 1942, the military presence in the north intensified further still.The installation of medical infrastructure on the Rocky Creek site commenced on 6 October 1942 with the arrival of the 19th Field Ambulance from Calcium.