<P> On 17 July, a mixed force of British regulars, Canadian fur traders and Native Americans captured the important trading post of Mackinac Island on Lake Huron from its small American garrison who, like Hull earlier, were not aware that war had broken out . While many of the Natives who had taken part in the attack either remained at Mackinac or returned to their homes, at least one hundred Sioux, Menominee and Winnebago warriors began moving south from Mackinac to join those already at Amherstburg, while the news induced the previously neutral Wyandots living near Detroit to become increasingly hostile to the Americans . Hull learned of the capture of Mackinac on 3 August, when the paroled American garrison reached Detroit by schooner . Fearing that this had "opened the northern hive of Indians", Hull abandoned all the Canadian territory he held . </P> <P> Hull's supply lines ran for 60 miles (97 km) along the Detroit River and the shore of Lake Erie, which was dominated by the British armed vessels, and were vulnerable to British and Native American raiders . On 4 August, at the Battle of Brownstown, a party under Tecumseh ambushed and routed an American detachment under Major van Horne, capturing more of Hull's despatches . Hull sent a larger party under James Miller to clear his lines of communication, and escort a supply convoy of 300 head of cattle and 70 pack horses loaded with flour, which was waiting at Frenchtown under Major Brush . On 9 August, at the Battle of Maguaga, Miller forced a British and Native force under Major Adam Muir of the 41st Regiment to retreat some distance, but when the British re-formed their line, he declined to resume the attack . Miller, who was ill and whose losses in the engagement were heavier than those of the enemy, seemed to completely lose confidence and remained encamped near the battlefield until Hull ordered him to return to Detroit . </P> <P> Meanwhile, Major General Isaac Brock, the British commander in Upper Canada, was in York, the provincial capital, dealing with the unwilling Assembly and mobilising the province's militia . Although he had only a single regiment of regulars and some small detachments of veterans and artillery to support the militia, he was already aware that there was no immediate threat from the disorganised and badly - supplied American forces on the Niagara River, or from the lethargic American commander in chief, Major General Henry Dearborn, at Albany in Upper New York State . Only Hull's army was occupying or threatening Canadian territory . Late in July, Brock learned of the capture of Mackinac . He was also informed by Lieutenant General Sir George Prevost, the Governor General of Canada, that an additional regiment he had asked for was being dispatched to Upper Canada, although as piecemeal detachments . Brock dispatched 50 of his small force of regulars and 250 volunteers from the militia westward from York to reinforce Amherstburg . On 5 August, he prorogued the Assembly and set out himself after them . He and his force sailed from Port Dover in batteaux and open boats and reached Amherstburg on 13 August, at the same time as 200 additional Native American warriors (100 "Western Indians" from Mackinac and 100 Wyandots) who joined Tecumseh . </P> <P> At Amherstburg, Brock immediately learned from Hull's captured despatches that the morale of Hull and his army was low, that they feared the numbers of Natives which might be facing them, and that they were short of supplies . Brock also quickly established a rapport with Tecumseh, ensuring that the Natives would cooperate with his moves . Brock and Tecumseh met for the first and only time shortly after Brock arrived at Amherstburg . Legend has it that Tecumseh turned to his warriors and said, "Here is a man!" Brock certainly wrote shortly afterwards, "...a more sagacious and a more gallant Warrior does not I believe exist ." </P>

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