Canada "actually" sent more than troops. 
HMCS Cayuga, Athabaskan and Sioux took part in the battle for the Pusan bridgehead in Korea. Five other tribal class destroyers, HMCS Crusader, Huron, Iroquois, Nootka, and Haida, served with the “Canadian Destroyer Division, Far East” in the waters off Korea during the war.

Heroic action, too: when the port city of Chinnampo was facing a massive enemy advance and the order was given to evacuate. Three Canadian destroyers were sent-- Chinnampo was more than 30 kilometres up the heavily mind Taedong River. Two UN ships ran aground, but, others, "led by HMCS Cayuga, reached the city after a nerve-wracking passage through shallow, twisting channels on a pitch-dark night. The destroyers guarded against possible enemy attack and helped destroy the railway lines, docks and supplies left behind so they could not be used by the enemy." 

Over 3,600 Royal Canadian Navy personnel served inKorea.  

Learn more at Veterans Affairs website. Please!