The Ovambo Uprising was an uprising against Portuguese colonial rule in World War I. It lasted from about 18 December 1914 to 6 February 1917 with the death of its leader, King Mandume yaNdemufayo, by South African forces in Namibia. The war pitted Portuguese troops, commanded by General António Júlio da Costa Pereira de Eça, against an Ovambo army, composed mainly of fighters from the Oukwanyama clan.