Leslie Jack Coulter DSO (Lt.) was born in Grenville. He was 26 years old, unmarried and employed as a mining engineer when he enlisted from Claremont, Tasmania, on December 1st 1915. He left Sydney with the Mining Corps on board the Ulysses in the following February by which time he had already been promoted to Captain. By the time he reached France in May, he had been promoted to Major and was in command of the 3rd Tunnelling Company. He was seriously wounded in July with gunshot wounds to his arm and back, and was evacuated to hospital in England. Upon his return to France he earned the Distinguished Service Order 'in recognition of his gallantry and devotion to duty in the field' and was twice Mentioned in Dispatches. He was killed in action near Loos, France, on June 29th 1917, aged 27, and is buried in the Hersin Communal Cemetery, France.

Two of his brothers also served in the AIF and are honoured with trees in the Avenue. Graham served in Gallipoli and France, and Jason died of wounds received at Gallipoli in August 1915. A third brother, Sydney, was killed in action during the Boer War.