[1][2][7][8] On 15 July 1912, "B" Squadron was transferred to the 33rd Vaudreuil and Soulanges Hussars and was replaced in the 17th by personnel from the disbanded 11th Argenteuil Rangers.
[3][8][9] On 6 August 1914, details of the 17th Duke of York's Royal Canadian Hussars "Argenteuil Rangers" were placed on active service for local protection duties.
[10] On 26 August 1939, details of the 17th Duke of York's Royal Canadian Hussars were called out on service and then on 1 September 1939, placed on active service under the designation as the 17th Duke of York's Royal Canadian Hussars, CASF, for local protection duties.
The regiment fought in northwest Europe in support of the 3rd Canadian Infantry Division until the end of the war.
[2][11] On 1 June 1945, the 2nd/7th Reconnaissance Regiment, CAC, CAOF was mobilized for service with the Canadian Army Occupation Force.
[5][12] The undress uniform also shared with that of other Canadian hussar regiments consisted of a dark blue serge frock jacket and a dark blue peaked cap with white band and piping and came with a removable white cover worn in the summer.