Early in the advance, Maxwell's company commander was severely wounded, resulting in Maxwell assuming control. Reaching the German barbwire defences under intense machine-gun fire, the company suffered heavy casualties, including all of the officers except Maxwell. Pushing forward alone through a narrow passageway in the wire, Maxwell captured the most dangerous machine gun, killed three Germans and took another four as prisoners; thereby enabling the company to move through the wire and reach their objective. Shortly afterwards, it was noticed that the company on their left flank was held up and failing to advance. Gathering a party of men, Maxwell led the group in an attempt to attack the German force from the rear. They soon came under heavy machine gun fire, and, single-handedly, Maxwell dashed forward and attacked the foremost gun. Firing his revolver, he managed to shoot five of the crew and silence the gun.