Leslie Jack Coulter DSO MID (Lt.) was born in Grenville. He was 26 years old, unmarried and employed as a mining engineer when he enlisted from Claremont, Tasmania, on 1st December 1915. He was posted to the 3rd Tunnelling Company, Australian Mining Corps, and reached France in May 1916. In July he was seriously wounded and evacuated to hospital in England. Upon his return to France he earned the Distinguished Service Order for 'conspicuous gallantry and devotion to duty' and was twice Mentioned in Despatches. He was killed in action near Loos, France, on the 29th June 1917, aged 26. He is buried in the Hersin Communal Cemetery, France.

His brother Jason died of wounds received at Gallipoli in August 1915 and is also honoured with a tree in the Avenue.