On 21 August 1918 "Hochelaga", while performing an anti-submarine patrol with a small flotilla of four ships off the coast of Nova Scotia, encountered the German submarine while the submarine was in the process of boarding and sinking Canadian fishing schooners. The commanding officer of "Hochelaga", Lieutenant R.D. Legate, ordered the ship to turn and head back towards the flotilla instead of intercepting the enemy. For failing to confront the enemy, Lieutenant Legate was placed under arrest and court-martialled in Halifax in October. Legate was found guilty and dismissed from the service. "Hochelaga" remained on the Atlantic patrol until the end of the war and remained in RCN service until 1920. The ship was briefly reactivated for active duty in July 1919 for the visit of the Prince of Wales to Canada and carried several guests, among them Admiral Sir Charles Kingsmill and the Governor General of Canada, along the St. Lawrence and Saguenay Rivers. In October 1919 "Hochelaga" was sent to tour the lighthouses and ship radio stations along the coasts of the Gulf of St. Lawrence and Newfoundland. "Hochelaga" was paid off on 30 October 1920 and put up for sale. The vessel was not sold until 23 February 1923 when John Simon of Halifax acquired the vessel.