On August 17, 1862, the Dakota uprising in Minnesota, supported by the Yankton Indians, killed hundreds of white settlers, forced 30,000 from their homes, and deeply alarmed the Lincoln administration. Some believed it was a conspiracy by the Confederacy to launch a war on the Northwestern front. Lincoln sent General John Pope, the former head of the Army of Virginia, to Minnesota as commander of the new Department of the Northwest. Lincoln ordered thousands of Confederate prisoners of war sent by railroad to put down the Dakota Uprising. When the Confederates protested forcing Confederate prisoners to fight Indians, Lincoln revoked the policy. Pope fought against the Indians mercilessly, even advocating their extinction. He ordered Indian farms and food supplies be destroyed, and Indian warriors be killed. Aiding Pope, Minnesota Congressman Col. Henry H. Sibley led militiamen and regular troops to defeat the Dakota at Wood Lake. By October 9, Pope considered the uprising to be ended; hostilities ceased on December 26. An unusual military court was set up to prosecute captured natives, with Lincoln effectively acting as the route of appeal.