Awarded the Victoria Cross for conspicuous gallantry for his actions on April 20, 1900, at Wakkerstroom during the second Boer War. Nickerson was a 25 years old Canadian medical officer in the Royal Army Medical Corps, attached to the Mounted Infantry, when his actions at Wakkerstroom led to the award of the Victoria Cross. His citation reads: “At Wakkerstroom, on the evening of the April 20, 1900, during the advance of the Infantry to support the Mounted Troops, Lieutenant Nickerson went, in the most gallant manner, under a heavy rifle and shell fire, to attend a wounded man, dressed his wounds, and remained with him till he had him conveyed to a place of safety.”
Following the end of the war in South Africa in June 1902, Nickerson returned to the United Kingdom on
board the SS Soudan, arriving in Southampton in September that year. He was then posted to Egypt.
He later achieved the rank of major general after service in World War I and was appointed Colonel-in-Chief of the RAMC in 1933