The 9th Division began to move from Australia to the island of Morotai in the Netherlands East Indies, where the Borneo campaign would be staged, in March 1945. The division had seen extensive combat in North Africa and New Guinea, and its officers and enlisted men were well trained for amphibious operations and jungle warfare. However, the 9th Division had been out of action since early 1944, leading to poor morale among its combat units. A large number of support, logistics and Royal Australian Air Force (RAAF) units were assigned to the division for the operations at Brunei Bay, taking its strength to over 29,000 personnel (including 1,097 in United States and British units).