1st Battalion - 18th Infantry Regiment

The 1st Battalion, 18th Infantry, a mechanized infantry battalion assigned to the 1st Infantry Division's 2nd Brigade Combat Team, was first constituted on 3 May 1861 in the Regular Army as Company B, 2nd Battalion, 18th Infantry. It was organized on 17 September 1861 at Camp Thomas, Ohio.

The unit was redesignated on 20 September 1861 as Company H, 1st Battalion, 18th Infantry, on 19 October 1861 as Company A, 1st Battalion, 18th Infantry, and again reorganized and redesignated on 21 September 1866 as Company A, 18th Infantry.

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