The South-East Asian Theatre of World War II consisted of the campaigns of the Pacific War in the Philippines, Thailand, Indonesia, Indochina, Burma, India, Malaya and Singapore between 1941 to 1945. Japan attacked British and American territories with near-simultaneous offensives against Southeast Asia and the Central Pacific on 7/8 December 1941. Action in this theatre ended when Japan announced an intent to surrender on 15 August 1945. The formal surrender of Japan ceremony took place on 2 September 1945. Outbreak of hostilities Conflict in this theatre began when the Empire of Japan invaded French Indochina in September 1940 and rose to a new level following the Attack on Pearl Harbor, and simultaneous attacks on Hong Kong, the Philippines, Thailand, Singapore and Malaya on 7 and 8 December 1941. The main landing at Singora (now Songkhla) on the east side of the Isthmus of Kra preceded the bombing of Pearl Harbor by several hours. Although Japan declared war on the United States and the British Empire, the declaration was not delivered until after the attacks began. On 8 December, the United Kingdom, the United States, Canada, and the Netherlands declared war on Japan, followed by China and Australia the next day. Initial Japanese successes The Allies suffered many defeats in the first half of the war. Two major British warships, and were sunk by a Japanese air attack off Malaya on 10 December 1941. Following the invasion, the government of Thailand formally allied itself with Japan on 21 December. Japan invaded Hong Kong in the Battle of Hong Kong on 8 December, culminating in surrender on 25 December. January saw the invasions of Burma and the Dutch East Indies and the capture of Manila and Kuala Lumpur. Malaya and Singapore Japanese forces met stiff resistance from III Corps of the Indian Army, the Australian 8th Division and British units during the Battle of Malaya, but Japan's superiority in air power, tanks and infantry tactics drove the Allied units back. After being driven out of Malaya by the end of January 1942, Allied forces in Singapore, under the command of Lieutenant General Arthur Percival, surrendered to the Japanese on 15 February 1942; about 130,000 Allied troops became prisoners of war. The fall of Singapore was the largest surrender in British military history. The Japanese Indian Ocean raid The Japanese Indian Ocean raid was a naval sortie by the Fast Carrier Strike Force