Enterprise was originally a British sloop named George, built at St. Johns (now Saint-Jean-sur-Richelieu) in Quebec, Canada. In May 1775, a small American force under Colonel Benedict Arnold sailed up the Richelieu River on the recently captured Liberty. At 07:00 on 18 May, Arnold and 35 raiders captured the fort and shipyards at St. Johns, along with the newly launched George, with no loss of life. The unlaunched schooner Royal Savage was also at the shipyard, and would be captured by the Americans later that year. Two hours later Arnold's raiders left with the newly captured sloop, which was later armed with 12 guns and renamed Enterprise.