MIKAN 3405685: Lt. J. Strachan, V.C.,; Squadron of Fort Garry Horse passing through village on Cambrai front. December, 1917. Dec., 1917. o.2295

Note: More likely 30 January 1918. FGH were in Roisel and Montecourt for the duration of December 1917. 
Caption should read: Squadron of Fort Garry Horse crossing Canal du Nord at Cambrai. As I wrote before, LAC photo annotations are often inaccurate.

MIKAN 3221438: Lieut. J. Strachan, V.C., who led the famous Squadron of Fort Garry horse against the Boche guns at Cambrai; led them back when they fought their way through with rifle and bayonet. Dec., 1917. o.2292