Union General William Rosecrans was a prominent military leader during the American Civil War. Born on September 6, 1819, in Delaware, Ohio, he graduated from the United States Military Academy in 1842. Rosecrans initially served in the Mexican-American War and later became known for his organizational skills and strategic planning. Rosecrans is best remembered for his role in the Battle of Stones River and the Chickamauga Campaign. Despite his successes, he faced criticism after the defeat at Chickamauga in September 1863, which led to his reassignment. He continued to serve in various capacities until the war's end.