War artist Arthur Lismer sketched this view from an American-built sub-chaser used by the Royal Canadian Navy.

After the first U-Boat attacks off the Atlantic coast in the summer of 1916, Canada sought to enlarge its navy through purchase, adaption of civilian ships, and new construction. In mid-1918, the United States loaned the RCN six wooden sub-chasers to assist in convoy escort and patrol. Uncomfortable for their crews, especially during heavy weather, these small vessels escorted convoys within some 300 kilometres of the Canadian coast.

Looking Astern on a Sub-Chaser
Drawn by Arthur Lismer
Beaverbrook Collection of War Art
CWM 19710261-0347