The Battle of Buna – Gona was part of the New Guinea campaign in the Pacific campaign of World War II. On 16 November 1942, Australian and United States forces attacked the main Japanese beachheads in New Guinea, at Buna, Sanananda and Gona. When the Japanese forces were within sight of Port Moresby, the Japanese leadership decided holding Guadalcanal was a higher priority, and they ordered their New Guinea forces to withdraw to the coast. Since arriving on the north coast in June, the Japanese had built hundreds of well-camouflaged, reinforced bunkers in mutually supporting positions blocking all available approaches. Combined with the forces who had returned from the Kokoda Track, the Japanese initially had nearly 5,500 troops on the northern coast. This rose to about 6,500 later in the battle. Both the Japanese and Allied forces were riddled by disease and lacked the most basic supplies, including medicine and food. Some U.S. troops were reduced to a small portion of a C ration each day.