During the French-Thai War, the Thai Air Force achieved several air-to-air-victories in dogfights against the Vichy Armée de l'Air. During World War II, the Thai Air Force supported the Royal Thai Army in its occupation of the Shan States of Burma as somewhat reluctant allies of the Japanese and took part in the defense of Bangkok against allied air raids in the latter part of the war, achieving some successes against state-of-the-art aircraft like the P-51 Mustang and the B-29 Superfortress. During these times, the RTAF was actively supplied by the Japanese with Imperial Japanese Army Air Force aircraft such as the Ki-43 "Oscar," and the Ki-27 "Nate." Other RTAF personnel took an active part the anti-Japanese resistance movement.