Grant, who was courteous to Buckner following the surrender, offered to loan him money to see him through his impending imprisonment, but Buckner declined. The surrender was a personal humiliation for Buckner and a strategic defeat for the Confederacy, which lost more than 12,000 men, 48 artillery pieces, much of their equipment, and control of the Cumberland River, which led to the evacuation of Nashville. This was the first of three Confederate armies that Grant would capture during the war. (The second was John C. Pemberton's at the Siege of Vicksburg and the third Robert E. Lee's Army of Northern Virginia at Appomattox). Buckner also turned over considerable military equipment and provisions, which Grant's troops badly needed. More than 7,000 Confederate prisoners of war were eventually transported from Fort Donelson to Camp Douglas in Chicago, Camp Morton in Indianapolis, and other prison camps elsewhere in the North. Buckner was held as a prisoner at Fort Warren in Boston until he was exchanged in August 1862.