Sheaffe returned to Quebec in July 1812 shortly after the United States had declared war on the United Kingdom. Sir
George Prevost, the
Governor General of Canada, appointed Sheaffe to take command of British troops on the Niagara frontier. Meanwhile, Prevost arranged a temporary armistice with Major General
Henry Dearborn, who commanded American forces in the northeastern United States, aiming to foster potential peace negotiations. When Sheaffe arrived at Fort George in mid-August, he took things a step further by negotiating agreement with his American counterpart, Major General
Stephen Van Rensselaer. The agreement prevented the forwarding of troops and supplies westward, but did little to prevent the buildup of American forces on the east side of the Niagara River. Prevost privately criticized Sheaffe for overstepping his authority but took no disciplinary action. Prevost's armistice was quickly repudiated by President
James Madison and hostilities began anew. Sheaffe arrived at Durham's Farm at mid-morning followed closely by the first of the British reinforcements from Fort George. Sheaffe had a
Royal Artillery detachment advance on the village, supported by a company of the 41st Regiment of Foot under Captain William Derenzy. When the British artillery opened fire, it once again became hazardous for American boats to cross the river. Two boats were sunk, and the American six-pounders across the river were repeatedly silenced by shrapnel fire. Meanwhile, Derenzy slowly began pushing the Americans out of the village. At the same time, Mohawk warriors from the
Grand River under
John Norton climbed the escarpment west of the village and began harassing the Americans on the heights. Norton later wrote that they "discharged Leaden death among them" A significant number of American soldiers began to abandon their posts, unnerved by the sight of the dead and wounded, and the war cries of the Mohawk. Sheaffe set out from Durham's Farm with roughly 650 men and marched across fields to ascend the escarpment, following the path that Norton had taken earlier. His forces then circled around to the south of the Americans. Sheaffe positioned the main body of his regulars facing the American line at a distance of about 400 yards (370 m). Two light companies of regulars,
Runchey's Coloured Company, and Norton's Mohawks moved into position west of the Americans. When three companies of the 41st Foot from
Chippewa arrived, Sheaffe ordered them into position on the eastern flank.
Battle of York . Source: Toronto Public LibrarySheaffe succeeded Brock as Upper Canada's military commander and acting Lieutenant Governor. He took the oath of office at York on 20 October 1812, but continued to spend much of his time at Fort George. That winter, he suffered from poor health and was preoccupied with military matters. In February, Sheaffe moved from Fort George to York. He opened the legislature of Upper Canada on 25 February 1813 and prorogued it two weeks later. Several bills were passed during the brief session, including legislation that authorized the creation of an incorporated militia battalion made up of volunteers who enlisted for the duration of the war. Another bill provided
annuities for disabled militiamen and for the widows and children of those killed. Most of the regulars were housed in a
stockaded garrison located west of town on the east side of Garrison Creek. Sheaffe's headquarters were at Government House on the creek's west side. Further to the west was the stone-walled "grand magazine" that held about 300 barrels of gunpowder, 750 explosive shells and 40,000 musket rounds. Four artillery batteries protected the entrance to the harbour, including the Western Battery, west of Government House, which mounted two obsolete
18-pounder long guns. With 18 guns in total, the British batteries were outmatched by the 83 guns mounted on the ships of Chauncey's squadron. '' from
Benson John Lossing's Pictorial Field-book of the War of 1812. Lossing incorrectly placed the garrison on the west side of the Garrison Creek. Sheaffe was at Government House when the Americans began landing. He quickly dispatched Givins with the Mississauga and Ojibwe to oppose the landing while the regulars and militia assembled. The Glengarries were ordered to support Givens but, for some inexplicable reason, they followed the militia, which had been sent north to block the road running west from York. The grenadier company of the 8th Foot was sent in their place but was forced back after suffering heavy casualties. Sheaffe then advanced in column with the Royal Newfoundland Fencibles and the second company of the 8th Foot. The British formed a line at a clearing west of Government House. Sheaffe ordered the Fencibles forward. The retreating grenadiers passed through the advancing line, pursued by the Americans who now engaged the Fencibles. The Fencibles fell back under heavy fire but were rallied by Sheaffe. The entire line advanced but was once again repulsed. Sheaffe then ordered a withdrawal back to the Western Battery. The landing took place out of sight of the batteries, and Chauncey's fleet had remained out of range. After disembarking their passengers, however, several schooners moved inshore and opened fire on the batteries. The British returned fire, but a gunner at the Western Battery accidentally caused a box of cartridges to explode, killing ten and wounding many others. With casualties mounting, Sheaffe decided that the battle was lost. He withdrew his regulars into York and ordered the magazine destroyed. Pike waited until the rest of his force had landed, then slowly proceeded forward. He had advanced to within of Government House and had sent an infantry detachment forward to conduct a reconnaissance when the magazine exploded. Debris flew in a 500-yard (460 m) radius, instantly killing 40 American soldiers. Over 200 were wounded, including Pike, who soon succumbed to his wounds. Despite this, the Americans continued their march towards York. Sheaffe ordered the destruction of the partially built
sloop-of-war Sir Isaac Brock, then began a 160 mile (260 km) march east to Kingston. Lieutenant Colonel William Chewett and Major William Allan of the 3rd York Militia were left to negotiate the terms of surrender. A total of 82 regulars, militia and Indigenous warriors were killed during the defence of York. An additional 111 were wounded, and seven were missing in action. 343 men were taken prisoner of whom 68 were wounded. Sheaffe regulars suffered the most casualties with 71 killed, seven missing, 31 wounded and 57 taken prisoner. Sheaffe's decision to retreat was denounced by several of York's prominent citizens, spurred by the looting and destruction that took place during the six-day American occupation of York. In a letter to Prevost, written by Reverend
John Strachan and signed by several of the town's residents, Sheaffe was accused of being indecisive during the battle, failing to give clear orders, and abandoning the town prematurely. In June 1813, Prevost had Sheaffe replaced as military commander and acting lieutenant governor. In a letter to
Henry Bathurst, the
Secretary of State for War and the Colonies, Prevost wrote that Sheaffe had "lost the confidence of the province." Sheaffe was briefly placed in charge of troops in the Montreal District, but on Prevost's recommendation was recalled to Britain. Sheaffe departed Quebec for England in November 1813. ==Subsequent career==