David Mann (Joe Dinicol), Sarah's younger brother, is ineligible for military service due to asthma but is determined to enlist. The Manns are ostracized when it becomes known their father died at Vimy Ridge fighting for the Imperial German Army. The father of David's girlfriend pulls strings to allow David to enlist. Dunne feels responsible for David's wellbeing and reenlists as a private under his mother's maiden name, McCrae, promising Sarah he will protect her brother.
