A number of specialist units were also raised, including three Australian tunnelling companies. Arriving on the Western Front in May 1916 they undertook mining and counter-mining operations alongside British, Canadian and New Zealand companies, initially operating around Armentieres and at Fromelles. The following year they operated in the Ypres section. In November 1916, the 1st Australian Tunnelling Company took over from the Canadians around Hill 60, subsequently playing a key role in the Battle of Messines in June 1917. During the German offensive in March 1918 the three companies served as infantry, and later supported the Allied advance being used to defuse booby traps and mines. The Australian Electrical Mining and Mechanical Boring Company supplied electric power to units in the British Second Army area.