Harry Barnum enlisted in the Canadian Overseas Expeditionary Force on 30 September 1916, giving his trade as that of butcher. He stated that he was born 14 August 1880 in Prince Edward County, although his birth record says that he was born on 14 August 1878 in Hastings County. He was assigned to the 2nd Battalion, Canadian Infantry (Eastern Ontario Regiment).
Harry died in May of 1917 as a result of wounds received during the Canadian Corps capture of Vimy Ridge, in the Nord-Pas-de-Calais region of France. The Battle of Vimy Ridge, which took place from 9 April to 12 April 1917, was one of the greatest battles in Canada’s history. For the first time in the Great War, all four Canadian divisions fought together on the same battlefield, bringing about a fantastic victory not only for Canadians but for the entire Allied force.
The Canadian National Vimy Memorial is a memorial site in France dedicated to the memory of Canadian Expeditionary Force members killed during the First World War. It also serves as the place of commemoration for First World War Canadian soldiers killed or presumed dead in France who have no known grave.