The Battle of Hong Kong (8–25 December 1941), also known as the Defence of Hong Kong and the Fall of Hong Kong, was one of the first battles of the Pacific War in World War II. On the same morning as the attack on Pearl Harbor, forces of the Empire of Japan attacked the British Crown colony of Hong Kong. The attack was in violation of international law as Japan had not declared war against the British Empire. The Japanese attack was met with stiff resistance from the Hong Kong garrison, composed of local troops as well as British, Canadian and Indian units. Within a week the defenders abandoned the mainland and less than two weeks later, with their position on the island untenable, the colony surrendered.