Leslie was the son of James and Elizabeth Bevan. As a child he attended Little Plain School, west of Inverell. When he enlisted at Toowoomba, Qld, in September 1914 he gave his age as twenty one and occupation as Farmer at Delungra NSW. Prior to enlistment he had been a member of the Delungra Rifle Club.
Leslie joined the Field Artillery Brigade3 and left Australia for Egypt on the ship A22 Rangatira in November 1914. He was a Driver with this unit. During March 1916 he was transferred to France where he served until returning home in January 1919.
In March 1919 the residents at Little Plain organised a ‘Welcome Home’ evening for several soldiers including Leslie. They were each presented with a ‘handsome gold medal, suitably inscribed.’ Leslie was active in the affairs of the Inverell RSL Sub Branch, becoming a Vice President in 1953.
Leslie’s name is inscribed on the Inverell and Delungra Honor Rolls and the new Anzac memorial at Delungra.