John Milton Brannan (1819–1892) was a career United States Army artillery officer who served in the Mexican–American War and as a Union Army brigadier general of volunteers in the American Civil War. He was in command of the Department of Key West in Florida and assigned to Fort Zachary Taylor. Most notably, Brannan served as a division commander of the Union XIV Corps at the Battle of Chickamauga in 1863. This photograph of Brannan was produced by the studio of the American photographer Mathew Brady circa the 1860s.Photograph credit: studio of Mathew Brady; restored by Adam Cuerden