 Complete the following phrase:  On 15 May 1918, Sergeant David Emmett Coyne was nominated for the Victoria Cross for throwing himself on a hand-grenade that he had thrown after it had accidentally bounced back off a parapet, in order to protect other soldiers. However, as this was not in the face of the enemy, the posthumous nomination was changed to that of the Albert Medal in Gold, the only such medal issued to a member of the AIF it was later superseded by the George Cross. Later, in August 1918, the 31st Battalion was involved in the last 