The 16th Infantry was constituted as the 11th U.S. Infantry on May 4, 1861. The 11th Infantry was organized by the direction of the president on May 4, 1861, and confirmed by the act on July 29, 1861. The regiment was organized into three battalions of eight companies each. On September 21, 1866, under the act of July 28, 1866, the Second Battalion became the Twentieth Infantry and the Third Battalion the Twenty-ninth Infantry. The regiment that actually fought during the Civil War was organized by order of the president on May 4, 1861, and confirmed by the act of July 29, 1861, as the 16th Infantry Regiment. On September 21, 1866, under the act of July 28, 1866, the Second Battalion became the Twenty-fifth Infantry and the Third Battalion became the Thirty-fourth Infantry. In actuality the present 16th Infantry was not involved in the Civil War, that regiment was consolidated into the 2d Infantry. The following campaign participation honors were actually earned by the 16th Infantry in the Civil War but went to the 2d Infantry with the consolidation; Atlanta, Chickamauga, Chattanooga, Georgia 1864, Kentucky 1862, Mississippi 1862, Murfreesboro, Shiloh, and Tennessee 1863.