William was a thirty nine year old Shearer when he enlisted in January 1916. He was the son of Mrs. E. Nicholson of Coonamble West NSW. He joined the men known as The Kurrajongs who left Inverell together on 12 January 1916 for the Narrabri and Armidale Camps.
William became a member of the 33rd Battalion, C Company which sailed from Australia on HMAT A74 Marathon in May 1916. Although William’s name appears on the Embarkation Roll, no service record has been found for him. Private Nicholson’s name is inscribed on the Inverell Honor Roll.