While on Crete, Hulme was attached to the divisional field punishment centre at Platanias, supervising soldiers who were being punished for criminal activity or breaches of discipline. On 20 May 1941, when German "Fallschirmjäger" (paratroopers) began landing on the island to begin the Battle of Crete, Hulme armed the soldiers in his charge and led them in efforts to deal with the Germans. Over the next two days, operating largely on his own, he stalked and eliminated several snipers. During this time, he came across a German at the punishment centre, killed him and then took his camouflage smock and sniper rifle. This enabled him to deceive German soldiers on his subsequent stalking missions.