 On 6 May, he mounted the Raid on Fort Oswego to interrupt the supply line from the New York Navy Yard to Sacket's Harbor.The raid was partially successful and the British captured several unarmed vessels, including the schooner "Growler" which changed hands for the third time.Yeo's main aim had been to capture heavy guns intended for Chauncey's own new frigates and heavy brigs, but although seven guns had been captured with "Growler", most of the American guns had not yet reached Oswego and were still up the Oswego River.