The Eritrean War of Independence was an armed conflict and insurgency aimed at achieving self-determination and independence for Eritrea from Ethiopian rule. Starting in 1961, Eritrean insurgents engaged in guerrilla warfare to liberate Eritrea Province from the rule of the Ethiopian Empire under Haile Selassie and later the Derg under Mengistu Haile Mariam. Their efforts ultimately succeeded in 1991 with the fall of the Derg regime.