on March 24, 1862, to rank from March 21, 1862. Cook remained in command of his brigade for a short time after Fort Donelson. Though still a colonel he was assigned to command the 6th Division in the Army of the Tennessee. This commanded was promptly turned over to Brig. Gen. Benjamin M. Prentiss who would lead the division at Shiloh. Cook meanwhile was transferred to brigade command in the Washington defenses. Cook later oversaw the military Department of Iowa and Dakota Territory. In the winter of 1862–63, he organized a campaign against the Sioux Nation, with Sioux City, Iowa, as his base of operations. In the spring of 1863, he was relieved by Brig. Gen. Alfred Sully. In November 1864, he was assigned command of the military District of Illinois, replacing Eleazar Paine, who had resigned the position. Cook was mustered out of the volunteers on August 24, 1865. On January 13, 1866, President Andrew Johnson nominated Cook for appointment to the brevet grade of major general, to rank from August 24, 1865, and the U.S. Senate confirmed the nomination on March 12, 1866. Years after the war Following the war, Cook returned home and was elected as Sangamon County's representative in the Illinois General Assembly, in 1869, as a Republican. Cook died in his home near Ransom, Michigan, in 1910, and is interred at Oak Ridge Cemetery in Springfield, Illinois. See also List of American Civil War generals (Union) References Bibliography Eicher, John H., and Eicher, David J., Civil War High Commands, Stanford University Press, 2001, . Gott, Kendall D. Where the South Lost the War: An Analysis of the Fort Henry—Fort Donelson Campaign, February 1862. Mechanicsburg, PA: Stackpole Books, 2003. . 1825 births 1910 deaths People from Belleville, Illinois People of Illinois in the American Civil War Union Army generals Mayors of Springfield, Illinois Republican Party members of the Illinois House of Representatives People from Hillsdale County, Michigan Burials at Oak Ridge Cemetery 19th-century American politicians Military personnel from Michigan