 Canada's participation included several naval vessels and aircraft, in addition to the 25th Canadian Infantry Brigade which served as part of the 1st Commonwealth Division.In late 1950, Princess Patricia's Regiment left for South Korea and in February 1951 entered the line as part of an Anglo-Australian brigade.Princess Patricia's regiment was engaged in heavy fighting during the Battle of Kapyong on 22–25 April 1951 when a Chinese assault caused a South Korean division to collapse in the Kapyong valley; Princess Patricia's regiment was sent with British, Australian and New Zealand units in to hold the line.