The Second Italo-Ethiopian War, also referred to as the Second Italo-Abyssinian War, was a war of aggression waged by Italy against Ethiopia, which lasted from October 1935 to May 1936. In Ethiopia it is often referred to simply as the Italian Invasion, and in Italy as the Ethiopian War. The war is regarded as the largest colonial campaign in history. Despite stiff resistance, the Ethiopian forces were overwhelmed by the technological superiority of the Italians, and the conflict ended with the fall of Addis Ababa and the formal annexation of Ethiopia into the Italian Empire.