Routed by American forces near Detroit, Major General Henry Procter abandoned both his army and indigenous allies. At this decisive point in the War of 1812, the British commander, leaving both Tecumseh and his men to die, lost not only the Battle of the Thames but also a military career spanning more than three decades. Disgraced, Procter demanded a court martial, hoping that an “honourable and impartial tribunal” would vindicate his retreat. Instead, he suffered a devastating reprimand that effectively ended his service. Published for the first time in North America, the trial’s minutes offer a wealth of historical detail about British, Canadian, and American history during the early nineteenth century.