William crossed the ocean with his family by way of the ship General McClellan. His given name was written as "Willard" on the General McClellan ship register. William was included on the list of Rawlins Company passengers published in Deseret News. The company he traveled with was also noted in local church financial records.
His birth date is confirmed by England Birth and Christening records. His death date comes from a personal online family history record without accompanying documentation. Additional evidence is needed to confirm its accuracy. The Wellsville Ward financial records confirm that he was traveling in this company.