General Jacob Brown pulled back to Fort George after the battle and the British did not pursue. Commanders Riall, Scott, Brown, and Drummond were all wounded; Scott's wounds ended his commission for the rest of the war. The Americans withdrew but withstood a prolonged siege of Fort Erie. The British tried to storm Fort Erie on 14 August 1814, but they suffered heavy losses, losing 950 killed, wounded and captured compared to only 84 dead and wounded on the American side. The British were further weakened by exposure and shortage of supplies. Eventually, they raised the siege, but American Major General George Izard took over command on the Niagara front and followed up only halfheartedly. An American raid along the Grand River destroyed many farms and weakened British logistics. In October 1814, the Americans advanced into Upper Canada and engaged in skirmishes at Cook's Mill, but they pulled back when they heard that the new British warship , launched in Kingston that September, was on its way, armed with 104 guns. The Americans lacked provisions and retreated across the Niagara after destroying Fort Erie. Meanwhile, 15,000 British troops were sent to North America under four of Wellington's ablest brigade commanders after Napoleon abdicated. Fewer than half were veterans of the Peninsula and the rest came from garrisons. Prévost was ordered to neutralize American power on the lakes by burning Sackett's Harbor to gain naval control of Lake Erie, Lake Ontario, and the Upper Lakes as well as to defend Lower Canada from attack. He did defend Lower Canada but otherwise failed to achieve his objectives, so he decided to invade New York State. His army outnumbered the American defenders of Plattsburgh, but he was worried about his flanks and decided that he needed naval control of Lake Champlain. Upon reaching Plattsburgh, Prévost delayed the assault until Downie arrived in the hastily completed 36-gun frigate . Despite the Confiance not being fully completed, she had a raw crew that had never worked together. Prévost forced Downie into a premature attack when there was no reason for the rush. The British squadron on the lake under Captain George Downie was more evenly matched by the Americans under Master Commandant Thomas Macdonough. At the Battle of Plattsburgh on 11 September 1814, the British had the advantage of larger vessels and guns; the American gunboats were more suited to engagements on Lake Champlain, while