The Second Battle of Tembien was a battle fought on the northern front of the Second Italo-Ethiopian War. This battle consisted of attacks by Italian forces under Marshal Pietro Badoglio on Ethiopian forces under Ras Kassa Haile Darge and Ras Seyoum Mangasha. This battle, which resulted in a decisive defeat of Ethiopian forces, was primarily fought in the area around the Tembien Province. The battle is notable for the large-scale use of mustard gas by the Italians.