 He then returned to the front lines in France.Leading an advance platoon in the Battle of Flers–Courcelette (part of the Battle of the Somme) in September 1916, he was severely wounded, and lay for over twelve hours in a shell hole, sometimes feigning death when Germans passed, and reading the classical playwright Aeschylus in the original Greek.The then-Prime Minister Asquith's own son, Raymond Asquith, was a brother officer in Macmillan's regiment, and was killed that month.