parade. Lineage Constituted 3 May 1861, in the Regular Army as the 1st Battalion, 18th Infantry Regiment. Organized 22 July 1861, at Camp Thomas, Ohio Reorganized and redesignated 21 September 1866, as the 18th Infantry Consolidated in April 1869 with the 25th Infantry (see ANNEX) and consolidated unit designated as the 18th Infantry Assigned 8 June 1917, to the 1st Expeditionary Division (later redesignated as the 1st Infantry Division) Relieved 15 February 1957, from assignment to the 1st Infantry Division and reorganized as a parent regiment under the Combat Arms Regimental System Withdrawn 16 June 1989, from the Combat Arms Regimental System and reorganized under the United States Army Regimental System ANNEX Constituted 3 May 1861, in the Regular Army as the 2d Battalion, 16th Infantry Regiment. Organized 12 May 1862, at Camp Thomas, Ohio Assigned to the 1st Division XIV Army Corps under Major General George H. Thomas, Participated at the Battle of Chickamauga, GA as part of the Third (Regular) Brigade and was instrumental in preventing the destruction of the Union Army under Major General William Rosecrans at Chickamauga, GA Sep 1863. Participated in the operations at Chattanooga, GA and the following Atlanta Campaign assigned to the Third Brigade. Served under Brig. General John H. King and Brig. Gen. Absalom Baird's First Division and MG John M Palmer until the Attack at Utoy Creek. The 18th US Infantry distinguished itself in its performance, along with the 15th US Infantry, in a combat water crossing at North Utoy Creek, securing the position for the 1st Division under Brigadier General Johnston 3 Aug 1864 and participated in the preliminary and main attacks on 6 August 1864. Involved in cutting the rail lines south of Atlanta at Rough and Ready Station (Forest Park GA 30 Aug 1864). After the Capture of Atlanta, the regiment and the rest of the Army of the Cumberland moved back in pursuit of Hood's Confederate Army into Tennessee. Involved in the Battle of Nashville and the destruction of the Confederate Army of Tennessee on 15–16 December 1864. The unit crest shows the symbol of the XIV Corps, the Acorn, adopted by Gen. George H. Thomas, "The Rock of Chickamauga." Reorganized and redesignated 21 September 1866, as the 25th Infantry Consolidated in April 1869 with the 18th Infantry and consolidated unit designated as the 18th Infantry On 17 March 2008, 1–18 Infantry was inactivated in Schweinfurt, Germany,