It is not clear when Donald returned to the 4th SAI at the front after his wedding. The letter from Reggie to Helen on the 5th May would indicate that he had returned before that date. However, he is not on the list of officers involved with the 4th SAI in the Battle of the Scarpe on the 9th April.

The 4th SAI are in action in the Battle of the Scarpe which is, initially, a great success but soon gets bogged down and the battalion’s last action in this battle is the ill-fated action at Fampoux where they get caught in machine gun crossfire.
Lt.Col. D.M.MacLeod returns after recovering from his wounds received at Delville Wood the previous July.