The tradition of Montgomery's serving and fighting has continued for generations, including three of William's sons. William Montgomery Jr, who enlisted upon his 14th birthday and served as a company drummer in his father's regiment during the New York and New Jersey Campaign, achieved the rank of major in the War of 1812. John Montgomery served under William's command in the 7th Division and achieved the rank of colonel. On July 27, 1809, Daniel Montgomery was commissioned a major general and transferred command of the 9th Division. William's 2nd great-grandson, James Montgomery Rice, fought extensively in the American Civil War, helped establish the United States National Guard, and honored William's service through Sons of the American Revolution. William's 4th great-grandson, Charles Montgomery Marriott, lost both of his hands, and was awarded the Silver Star, from a stielhandgranate while saving his platoon during the Rhineland Offensive of World War II.