About the same time Sir James Yeo, who had dared to attack the superior squadron of Commodore Chauncey on Lake Ontario, and took two of his schooners, now prevailed on the spiritless Sir George Prevost to join him in an attack on Sacketts Harbour. Here the Americans had a dockyard, where they built vessels for the lake fleet, and had now a frigate nearly ready for launching. Sir George consented, but, on reconnoitring the place, his heart failed him, and he returned across the water towards Kingston. Sir James was highly chagrined, but prevailed on this faint-hearted governor to make the attempt. Seven hundred and fifty men were landed, who drove the Americans at the point of the bayonet from the harbour, and set fire to the new frigate, to a gun-brig, and to the naval barracks and arsenal abounding with stores. Some of the Americans were in full flight into the woods, and others shut themselves up in log barracks, whence they could soon have been burnt out. In the midst of this success the miserable Sir George Prevost commanded a retreat. Men and officers, astonished at the order, and highly indignant at serving under so dastardly a commander, were, however, obliged to draw off. The Americans, equally amazed, turned back to endeavour to extinguish the flames. The arsenal, the brig, and the stores were too far gone; but the new frigate, being built of green wood, had refused to burn, and they recovered it but little injured. Thus, however, was lost the chance of crushing the American superiority on the lake, which must have been the case had Sacketts Harbour been completely destroyed. Sir James Yeo, greatly disappointed, put Sir George Prevost and his troops over to Kingston again, and then proceeded to the head of the lake, to reinforce General Vincent. Dearborn, as soon as he heard of this junction, fled along the lake shore to Fort George, where he shut himself up in a strongly-entrenched camp with about five thousand men. There Vincent, however, determined to attack him, but once more he was met by the curse of an incompetent appointment. Major-General Rottenburg had been made Governor of Upper Canada, and assumed the command over the brave Vincent, only to do nothing.