Some info on this war:

Brief summary:

http://www.onwar.com/aced/nation/eat...hiopia1935.htm

In addition to conventional weaponry, Badoglio's troops also made substantial use of mustard gas, in both artillery and aerial bombardments. In total, the Italians deployed between 300 and 500 tonnes of mustard gas during the war, despite having signed the 1925 Geneva Protocol. The deployment of gas was not restricted to the battlefield, however, as civilans were also targetted by the Italians, as part of their attempt to terrorise the local population. Furthermore, the Italians carried out gas attacks on ICRC camps and ambulances.

http://en.wikipedia.org/wiki/Second_...Abyssinian_War

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