In October 1935 Italian troops invaded Ethiopia – then also known as Abyssinia – forcing the country's Emperor, Haile Selassie, into exile. Ignoring protests from the League of Nations, the Italian dictator Benito Mussolini proclaimed a new Italian empire in East Africa, comprising Ethiopia and the pre-existing territories of Italian Somaliland and Eritrea.
Following early successes by Italy's ally, Germany, in the Second World War, Mussolini declared war on Britain in June 1940. This meant that British possessions in East Africa, as well as British-controlled Egypt and the vital supply route of the Suez Canal, were now threatened.
The Italians attacked border posts in Kenya and Sudan, and captured British Somaliland in August. The Italian Viceroy, the Duke of Aosta, then ordered his troops to halt, allowing the initiative to pass to the British.
General Archibald Wavell, British Commander-in-Chief Middle East, planned a three-pronged counter-offensive to dismantle Italy's East African Empire. His force was outnumbered, but he had air support from the Royal Air Force (RAF).
Meanwhile, Lieutenant General Alan Cunningham advanced north from Kenya into Italian Somaliland, while a third force crossed from Aden to retake British Somaliland by amphibious assault. These then linked up and pushed deep into Ethiopia.
In April British troops entered the capital Addis Ababa, and Haile Selassie returned in triumph on 5 May. The Duke of Aosta chose to fight on, and led his men to the mountain stronghold of Amba Alagi, near the Eritrean border. Here they held out for a further two weeks before surrendering.
The last Italian troops in East Africa were defeated at the Battle of Gondar in November 1941. But several thousand escaped to wage a guerrilla war until September 1943, when Italy surrendered to the Allies.