The Ross rifle is a straight-pull bolt action rifle chambered in .303 British that was produced in Canada from 1903 until 1918.
Ross rifle in the Royal Canadian Regiment Museum in London, Ontario
Mechanism comparison between Ross Mk III (1910) and Mk II** (1907)
38th Battalion CEF armed with the Ross on Queen Street, City of Hamilton, Bermuda in 1915
Lieutenant-General Sir Edwin Alfred Hervey Alderson, KCB was a senior British Army officer who served in several campaigns of the late nineteenth and early twentieth centuries. From 1915 to 1916 during the First World War he commanded the Canadian Expeditionary Force on the Western Front, during which time it saw heavy fighting.
Photo of Alderson, c. 1915