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2nd Battalion, 12th Infantry Regiment

The 2nd Battalion, 12th Infantry Regiment was first constituted on 3 May 1861 in the Regular Army as Company B, 1st Battalion, 12th Infantry. It was organized on 20 October 1861 at Fort Hamilton, New York. During the American Civil War, the 12th Infantry Regiment as a whole fought in campaigns with the Army of the Potomac, and played pivotal roles in some of the greatest battles of the war. Its first engagement at Gaines' Mills, Virginia, between 27 and 28 June 1862, was notable for the Regiment's losses of almost 50 percent. After the war, the unit was reorganized and redesignated on 7 December 1866 as Company B, 12th Infantry.

The 12th Infantry Regiment subsequently served in 3 major Indian campaigns, Modocs, Bannocks, and Pine Ridge, during which 6 Warriors won the Medal of Honor. During the Spanish American War, the 12th Infantry was dispatched to Cuba, where they participated in the Santiago campaign. The Regiment was also sent the help suppress the insurrection in the Philippines, where they campaigned around Manila and throughout the island of Luzon, participating in 3 campaigns: Malolos, Tarlac, and Luzon 1899.

The 12th Infantry as a whole was assigned on 17 December 1917 to the 8th Division. It was relieved on 15 August 1927 from assignment to the 8th Division and assigned to the 4th Division. It was relieved on 1 October 1933 from assignment to the 4th Division and reassigned to the 8th Division.

The Regiment was relieved on 10 October 1941 from assignment to the 8th Division and assigned to the 4th Division (later redesignated as the 4th Infantry Division. During World War II, the 12th Infantry spearheaded the Normandy Invasion on D-Day. Between 9 and 12 August 1944, the Regiment engaged and destroyed the famed SS Adolph Hitler Panzer Division, then went on to wins a Presidential Unit Citation during the Battle of the Bulge. After the end of the Second World War, the unit was inactivated on 27 February 1946 at Camp Butner, North Carolina

Company B, 12th Infantry was rectivated on 15 July 1947 at Fort Ord, California. The unit was inactivated on 1 April 1957 at Fort Lewis, Washington, and relieved from assignment to the 4th Infantry Division. It was redesignated 1 August 1957 as Headquarters and Headquarters Company, 2nd Battle Group, 12th Infantry, assigned to the 8th Infantry Division, and activated in Germany, with its organic elements concurrently constituted and activated. It was relieved 24 March 1959 from assignment to the 8th Infantry Division and assigned to the 1st Infantry Division.

The Battle Group was reorganized and redesignated on 1 October 1963 as the 2nd Battalion, 12th Infantry. It was concurrently relieved from assignment to the 1st Infantry Division and assigned to the 4th Infantry Division. Deployed to Vietnam, 2-12th Infantry operated as an element of the 4th Infantry Division until it was relieved on 1 August 1967 from assignment to the 4th Infantry Division and assigned to the 25th Infantry Division. The 2nd Battalion, 12th Infantry participated in 11 campaigns in Vietnam: Counteroffensive Phase II, Counteroffensive Phase III, Tet Counteroffensive, Counteroffensive Phase IV, Counteroffensive Phase V, Counteroffensive Phase VI, Tet 69/Counteroffensive, Summer-Fall 1969, Winter-Spring 1970, Sanctuary Counteroffensive and Counteroffensive Phase VII. After returning from Vietnam, the Battalion was inactivated on 17 April 1971 at Fort Lewis, Washington.

The Battalion was relieved on 1 April 1976 from assignment to the 25th Infantry Division, assigned to the 4th Infantry Division, and activated at Fort Carson, Colorado. It was inactivated on 21 September 1976 at Fort Carson, Colorado. It was reactivated on 16 June 1989 at Fort Carson, Colorado and inactivated again on 15 September 1995 at Fort Carson, Colorado, being relieved from assignment to the 4th Infantry Division.

The Battalion was reactivated on 29 September 2005 at Fort Carson, Colorado, as an element of the 2nd Infantry Division. It was redesignated on 1 October 2005 as the 2nd Battalion, 12th Infantry Regiment. It was relieved on 16 November 2005 from assignment to the 2nd Infantry Division and assigned to the 2nd Brigade Combat Team, 2d Infantry Division.

In 2008, the US Army conducted a major realignment involving the 4th Brigade Combat Team, 4th Infantry Division. The Brigade Combat Team was reflagged as the 4th Brigade Combat Team, 1st Cavalry Division. The 2nd Brigade Combat Team, 2nd Infantry Division at Fort Carson, Colorado was reflagged as the 4th Brigade Combat Team, 4th Infantry Division. Instead of being reflagged as a different unit as part of the 4th Brigade Combat Team, 4th Infantry Division, the 2nd Battalion, 12th Infantry was relieved on 16 March 2008 from assignment to the 2nd Brigade Combat Team, 2nd Infantry Division, and was assigned to the 4th Brigade Combat Team, 4th Infantry Division.




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