Source: Per Roll of Honour in Duty Nobly Done. Found during cross-check of database.

PTE. LONG’S DEATH.
Weston, April 12,–(Special.|)–Rev. Dr. Long received word to-day of the death of his son, Pte. A.G. Long, by shell shock in Belgium on March 29th. He was with the 18th Battalion and formerly of with the Goodyear Company at Calgary. He was well known at Brampton and Bradfor. Pte. Long spent Christmas Day in the front line of trenches. Two brothers and two sisters and the parents survive.
Source: The Globe Toronto Thursday April 13, 1916.

Tecumseh Player Killed in France
In yesterday’s casualty list appears the name of Arthur Long, the [Toronto] Tecumseh lacross player, who was a member of the Indians the last year they were in the Big Four. Last season he stated in the Ottawa City League, but enlisted in June and a couple of weeks later he volunteerted for overseas service when a draft of two hundred men was required from Niagara camp. He played with the Tecumsehs at Niagara two days before he sailed, when the two local teams [winged?] a game at the summer camp for the entertainment of the soldiers. Long is a western boy and played with the Eaton club in the C.I.A before he joined the Tecumsehs. He was a defence man and gave every promise of developing into one of the best in the game.
Long played with the champion Young Toronto team of 1911, and participated in the two games against Vancouver A.C., when the latter defeated the Young Torontos and took the Mann Cup west.
Source: The Globe Toronto Friday April 14, 1916.
