Tecumseh

Tecumseh has been viewed as a war hero in the War of 1812. I actually believe he hurt the overall war effort by threatening the British unless they fought on his terms. Overall native allies were instrumental in the defence of Canada, but John Norton and other leaders helped Canada not hurt it.

From Richard Feltoe's the Flames of War;

The British were forced to fight two unwinnable battles by Tecumseh and his natives. The result was the loss of all of their forces in South Western Upper Canada at Fort Stephenson and especially Moraviatown. Proctor actually fled the field before the Americans even attacked at Moraviantown. He knew they were being forced to fight an impossible battle.

Other Sources; Osprey's "Tecumseh" and Pierre Burton's volumes.