Mandalay Fort was originally built in 1857. Once the British took possession of this fort, it was turned into their Government House and rechristened as Fort Dufferin after a British Viceroy of India. The structure is now used by the Burmese military.Mandalay Fort was originally built in 1857. Once the British took possession of this fort, it was turned into their Government House and rechristened as Fort Dufferin after a British Viceroy of India. The structure is now used by the Burmese military.