From the book Ethiopia A Short Illustrated History, edited by Kiros Habte Selassie and Mazengia Dina.
REASONS FOR ETHIOPIAN DEFEAT
1. The Ethiopian armies were defeated by better trained, and far better armed, forces – especially in artillery and planes.
2. By the treachery of some Ethiopian leaders, and by the weakness of the others when faced by an entirely new sort of war about which they knew nothing.
3. The Ethiopian soldiers were demoralised by the use of poison and planes.
4. The Ethiopian government, without a modern army the equal of Italy’s (as had been the case in 1896), put much of its trust in the League of Nations, which here proved useless.