Source: Duty Nobly Done Roll of Honour 18th Bn. compiled and edited by Edward H. Wigney.
Note that a medical board recommended he be transferred from the infantry to military service that did not require much walking as he had fallen arches. The board report is dated June 17, 1915. Pte. Arnold served with the 18th Bn. until he was killed in action on August 9, 1917.
Another Goderich man has given his life for the great cause. Word was received Monday that Pte. Mark Arnold was killed in action August 9th. Besides his wife, he leaves one son, Fred, who is with a forestry battalion in Scotland, and one daughter, Beatrice, at home. Pte. Arnold enlisted early in the war with the 18th Battalion, going overseas with the late Major Sale. He was thirty-eight years of age. The widow and children have the sympathy of the people of Goderich in their great loss.
The Signal, 1917-8-23, Page 1.
War Diary of the 18th Battalion CEF 