The invasion of Darfur was the military invasion and occupation of the Sultanate of Darfur by the British Empire and the Sultanate of Egypt from 16 March to 6 November 1916. The sultan of Darfur, Ali Dinar, had been reinstated by the British after their victory in the Mahdist War but during the First World War he grew restive, refusing his customary tribute to the Sudanese government and showing partiality to the Ottoman Empire in 1915.