John Pope Cook (June 12, 1825 – October 13, 1910) was an Illinois politician and a general in the Union Army during the American Civil War. He served in the Western Theater and played a prominent role in securing the Union victory at the Battle of Fort Donelson, helping to force the surrender of the defenders. He was the second Congressman from Illinois. In 1855 he was Mayor of Springfield and 1856 he became the Sheriff of Sangamon County. In 1861 he gathered troops after the bombardment of Confederate of Fort Sumter and after that became colonel of the 7th Illinois Volunteer Infantry. In 1864 he got a promotion to brigadier general. Early life Cook was born in Belleville, Illinois, to a well-connected political family. His maternal grandfather, Ninian Edwards, was a United States senator and the Governor of Illinois. His father was Daniel Pope Cook, who was a member of the United States House of Representatives at the time. Following Daniel's death at the age of 33, his widow, Julia Catherine Edwards Cook, moved with their only child, John, back to Belleville, where she died three years later, leaving Cook as an orphan. Cook received a good education and entered the practice of law. He was elected mayor of Springfield, Illinois, in 1855. Cook was the captain and commander of a military company called the Springfield Grays. He also served as quartermaster general of the Illinois militia. Civil War During the early days of the Civil War, Cook's militia company enlisted in Federal service in April 1861. They formed the nucleus of Company I of the 7th Illinois Volunteer Regiment, of which Cook was appointed colonel. At the Battle of Fort Donelson, he commanded the 3rd Brigade, 2nd Division, District of Cairo, Department of the Missouri. During the Confederate breakout attempt on February 15, General Ulysses S. Grant concluded the Confederates must have weakened the opposite flank to reinforce their assault. This weakened sector lay across from the Federal brigades of Cook and Jacob G. Lauman. Lauman's brigade was intended as the main thrust while Cook's brigade would make a feint to draw away fire. Cook's troops nevertheless managed to capture a key Confederate artillery battery, which paved the way for the subsequent collapse of the defensive line in his sector. After the battle he was promoted to brigadier general of volunteers on March 22, 1862, with Senate confirmation