The East African Campaign started with Italian advances into British-held Kenya, British Somaliland, and Sudan. In the summer of 1940, Italian armed forces successfully invaded all of British Somaliland. But, in the Spring of 1941, the British had counter-attacked and pushed deep into Italian East Africa. By 5 May, Haile Selassie I of Ethiopia had returned to Addis Ababa to reclaim his throne. In November, the last organised Italian resistance ended with the fall of Gondar. However, following the surrender of East Africa, some Italians conducted a guerrilla war which lasted for two more years.