Team Logo. The Prince William Cannons were a team in the Carolina League. They were the High-A affiliate of the St. Louis Cardinals. In 1999 they became the Potomac Cannons. Retrieved from "https://prosportsteams.fandom.com/wiki/Prince_William_Cannons?oldid=9999" Categories: Former CarL Teams Teams in Virginia Add category Cancel Save Community content is available under CC-BY-SA unless otherwise noted.