WWI Royal Navy 60th Anniversary Sinking of German Gunboat Hedwig Von Weissman Lake Tanganyika by HM Motor Gunboats Mimi and Fifi Signed Commemorative First Day Cover Autographed by Lieut. Cdr. B Westlake - 9th February 1981. 5x7 inches The East African campaign in World War I was a series of battles and guerrilla actions, which started in German East Africa (GEA) and spread to portions of Portuguese Mozambique, Northern Rhodesia, British East Africa, the Uganda Protectorate, and the Belgian Congo. The campaign all but ended in German East Africa in November 1917 when the Germans entered Portuguese Mozambique and continued the campaign living off Portuguese supplies.