In 1885, Lieutenant-Colonel W.E. O'Brien, 35th Simcoe Foresters, took command of the York-Simcoe Battalion, which was formed from four companies of the 35th Simcoe Foresters and four companies of the 12th York Rangers to counter the Riel Rebellion in western Canada. In recognition of this contribution, 35th Simcoe Foresters received its first battle honour "North West Canada 1885".