During the heavy Turkish counter-attack of 19 May, Wilder showed "capacity to command at a difficult moment". On the night of 27 May, he commanded a raid by 63 soldiers of the battalion on a Turkish position south of the Anzac perimeter near Gaba Tepe. The destroyer used its searchlight to pinpoint the trench to be attacked, then pounded it with twenty rounds of high explosive and shrapnel from its guns. Wilder then led his force quickly up the hill towards the Turkish position, and using only the bayonet, they killed six, captured one, and returned to the Australian lines without suffering casualties. According to his biographer, Alec Hill, the success of the raid was ensured by his meticulous planning. He was wounded in early June and evacuated to Egypt, but discharged himself from hospital and returned to his unit by early August, when he was promoted to lieutenant. In the same month, he was mentioned in despatches for the first time.