After the Battle of France and the fall of the French Third Republic, the colonial administration of Indochina (modern-day Vietnam, Laos and Cambodia) passed to Vichy France. In September 1940 Japanese troops entered parts of Indochina; in July 1941 Japan occupied the entire territory. Thailand took this opportunity to reclaim previously lost territories, resulting in the Franco-Thai War between October 1940 and May 1941. Japan used Indochina to launch part of its invasion of Malaya; this and attacks on Pearl Harbor and other British and American territories sparked the Pacific War, bringing World War II to Indochina.