On the outbreak of the First World War, Sharpe was initially passed over for a command position and was not part of the First Contingent of the
Canadian Expeditionary Force that deployed overseas in 1914. Sharpe considered his past conflict with Minister
Sam Hughes as the reason he was overlooked, and expressed concern that this would affect his reputation. In November 1915, Sharpe was authorized by Hughes to raise a battalion from
Ontario County. This led to the creation of the
116th Battalion (Ontario County), CEF, with many members drawn from the 34th Regiment and several personally recruited by Sharpe. Sharpe used his political influence to ensure that the 116th was kept together as a unit in Europe and not dispersed to reinforce existing units. The Battalion arrived in England in the summer of 1916 and, following training, was deployed to the front in France in February 1917. Sharpe commanded the Battalion in action, beginning with the
Battle of Vimy Ridge in April 1917. Subsequent actions included an attack at
Avion in preparation for the
Battle of Hill 70, and the
Battle of Passchendaele. Sharpe began to struggle with the impact of his military service. In October 1917, he wrote to Muriel Hutchison, the widow of Lieutenant Thomas Hutchison. Sharpe had served with Hutchison in the 34th Regiment before the war, and was present when he was injured by a shell blast, administering first aid to him. In his letter to Muriel, Sharpe said:It is awful to contemplate the misery and suffering in this old world, and were I to allow myself to ponder over what I have seen and what I have suffered thro [sic] the loss of the bravest and best in the world, I would soon become absolutely incapable of 'carrying on'. In December 1917, Sharpe returned to England for a senior officer's course. Early the next year he was awarded the
Distinguished Service Order in the
1918 New Year Honours. A short time after receiving the award, he was hospitalized with a diagnosis of "general debility". In May 1918, Sharpe returned to Canada on convalescent leave. En route back to Uxbridge with his wife, he was hospitalized at
Montreal's
Royal Victoria Hospital for
nervous shock. ==Death and legacy==