From 29 September to 1 October 1918, Wark assumed temporary command of the 32nd Battalion, leading the unit in the 5th Division's attack against the Hindenburg Line at Bellicourt (part of the Battle of St Quentin Canal), and the subsequent advance through Nauroy, Etricourt, Magny La Fosse and Joncourt. This series of battles became the 32nd Battalion's final actions for the war, and it was during this period that Wark earned his Victoria Cross.