Chauncey and Dearborn subsequently won the Battle of Fort George on the Niagara peninsula, but they had left Sacket's Harbor defended only by a few troops, mainly militia. When reinforcements from the Royal Navy commanded by Commodore James Lucas Yeo arrived in Kingston, Yeo almost immediately embarked some troops commanded by Prévost and attacked Sackett's Harbor. Although the British were repelled by the defenders at the Second Battle of Sacket's Harbor, Chauncey immediately withdrew into Sacket's Harbor until mid-July, when a new heavy sloop of war had been completed.