The 16th Infantry was constituted as the 11th U.S. Infantry on 4 May 1861 under the command of Colonel Erasmus D. Keyes and organized by Major DeLancey Floyd-Jones. The 11th Infantry was organized by direction of the president 4 May 1861 and confirmed by the act on 29 July 1861. The regiment was organized into three battalions of eight companies each. On 21 September 1866 under the act of 28 July 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 4 May 1861 and confirmed by the act of 29 July 1861 as the 16th Infantry Regiment. On 21 September 1866 under the act of 28 July 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.