Procter won a resounding victory over an American brigade commanded by Brigadier-General James Winchester at the Battle of Frenchtown, though his tactics did not escape criticism. He had allowed his men to open fire too soon, which alerted the Americans to his attack. He also placed his artillery within American rifle range, which resulted in his gunners becoming casualties unnecessarily. Nevertheless, his surprise attack overwhelmed the Americans and forced Winchester to surrender. Following his victory, he learned that General Harrison's main army was coming to Winchester's support. Procter had only enough carts to transport his own severely wounded, and in his haste to retreat, he left 68 severely wounded American prisoners behind with only a small guard of Canadian militiamen. That night, Procter's Indian allies murdered the wounded prisoners in what became known as the Massacre of the River Raisin. This gave American troops a new battle-cry: "Remember the Raisin!"