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When war broke out in South East Asia in 1941, one hill tribe - the Christian, English-speaking Karen - distinguished itself in the fight against Japan. Karen helped halt the Japanese, taught British Army regulars to fight in the jungle, and worked with Force 136 - the British sabotage unit immortalised in the fiction film 'The Bridge on the River Kwai'. Fifty years later they are fighting for their independence . Using newly unearthed archive material and documents, Timewatch tells why the Karen feel abandoned by the British and how they remain in a brutal civil war with the Burmese.