George Prevost, who was also proceeding to Kingston. This was Prevost's second visit to Upper Canada in four months, as he thought it would probably prove necessary to replace Major General Roger Hale Sheaffe, who had lost the confidence of the Provincial Assembly after his defeat at York. Prevost and Yeo arrived at Kingston on 15 May. While Prevost reorganised his command and attempted to raise the morale of the militia and civil authorities, Yeo hastened the completion of the new sloop-of-war and the refitting of several other armed vessels. (Much of the work had already been accomplished by three officers, Commanders Robert Heriot Barclay, Robert Finnis and Daniel Pring, who had been detached from the naval establishment at Halifax, Nova Scotia). Prevost and Yeo knew that when the Wolfe was completed, Yeo's squadron would be slightly superior to Chauncey's, but also that the Americans were building the 28-gun heavy sloop-of-war at Sackett's Harbor, which would return the advantage to Chauncey. On 25 May, Chauncey's squadron was sighted off Fort George. The British commander there, Brigadier General John Vincent, immediately sent a dispatch vessel to Kingston with the information. (Two days later, he was driven from his position with heavy losses at the Battle of Fort George.) On learning of Chauncey's presence off Fort George, Yeo and Prevost realised that the American squadron and Dearborn's army would probably be occupied there for several days. They had an opportunity to capture Sacket's Harbor, and deliver a decisive blow to the shipyard to ensure that the British gained naval supremacy on the lake. Battle British forces The available British troops at Kingston, consisting of the grenadier company of the 100th Regiment, two companies of the 8th (The King's) Regiment of Foot, four companies of the 104th Regiment, one company of the Glengarry Light Infantry, two companies of the Canadian Voltigeurs and a detachment of Royal Artillery with two 6-pounder guns, were hastily assembled and embarked on Yeo's vessels. As no General officer was immediately available to command them, Prevost himself led the expedition, although he delegated command of the troops once they were ashore to his Adjutant General, Colonel Edward Baynes. Battle of Henderson Bay The British force set out late on 27 May and arrived off Sacket's Harbor early the next morning. The wind was very light, which made it difficult for Yeo to manoeuvre close to the shore. He was