Suffering synovitis to his right knee, Maxwell was hospitalised for two days and posted to a training battalion in England on 28 November 1916. He stayed there for five months before embarking for France on 9 May 1917 and rejoining the 18th Battalion five days later. Maxwell was only briefly in France before being selected for officer training. Shortly after arriving in England, he attended a boisterous party with a group of soldiers. The military police raided the party and called the local police for assistance after confronting Maxwell's group. Maxwell was fined £20 and sent back to his unit for his actions.