On 8 March 1918, Maxwell commanded a scouting patrol that was operating to the east of Ploegsteert. Having obtained the required information, he ordered the patrol to withdraw. He and three of his men were covering the withdrawal of the main body when he noticed about thirty Germans nearby. Recalling the patrol, he led an attack against the party, which had sheltered in an old trench; the Germans quickly withdrew, leaving three dead and one wounded prisoner of war. Maxwell was awarded the Military Cross for his actions during this engagement, news of which was published in a supplement to the "London Gazette" on 13 May 1918.