The Free Thai Movement (, , ) was a Thai underground resistance movement against the Empire of Japan during the Second World War. The Free Thai Movement were an important source of military intelligence for the Allies in the region.
Background
In the aftermath of the Japanese invasion of Thailand on 7–8 December 1941, the regime of Plaek Phibunsongkhram (Phibun) declared war on the United Kingdom and the United States on 25 January 1942. Seni Pramoj, the Thai ambassador in Washington, refused to deliver the declaration to the United States government.
thumb|This is a photograph of a group of Thai students training as part of the [[British Indian Army during the Second World War at the Eastern Warfare School in India, 1944–1945. They were likely part of the Free Thai Movement.]]
Accordingly, the United States refrained from declaring war on Thailand. which damaged targets in Bangkok and elsewhere and caused several thousand casualties. Throughout the bombing campaign, the Seri Thai network was effective in broadcasting weather reports to the Allied air forces and in rescuing downed Allied airmen. The new government was headed by Khuang Aphaiwong, a civilian linked politically with conservatives such as Seni.