The “Warhorse” Brigade, 4th Infantry Division (Mechanized) was constituted Nov. 19, 1917, in the regular Army as Headquarters, 7 Infantry Brigade, an element of the 4th Division. It was then organized in December 1917 at Camp Greene, North Carolina.
The brigade served valiantly during World War I and earned battlefield streamers for its participation in the Aisne-Marne, Saint Mihiel, Meuse-Argonne, Champagne-1918 and Lorraine-1918 Campaigns.
The unit was reorganized and redesignated in March 1921 as Headquarters and Headquarters Company, 7th Infantry Brigade. The unit was inactivated on Sept. 21, 1921, at Camp Lewis, Washington. It was redesignated on March 23, 1925, as Headquarters and Headquarters Company, 7th Brigade, and relieved on Aug. 15, 1927, from assignment to the 4th Division and assigned to the 7th Division. It was relieved on Oct. 1, 1933, from assignment to the 7th Division and assigned to the 4th Division. It was redesignated on Aug. 24, 1936, as Headquarters and Headquarters Company, 7th Infantry Brigade and disbanded on Oct. 16, 1939.
With tensions rising in the Republic of Vietnam, the brigade was reconstituted on Aug. 21, 1963, in the regular Army as Headquarters and Headquarters Company, 2nd Brigade, 4th Infantry Division and activated Oct. 1, 1963, at Fort Lewis, Washington. During the Vietnam War, the 2nd Brigade received battlefield streamers for participation in eleven combat campaigns.
After the Vietnam War, the brigade fought the rest of the Cold War while stationed at Fort Carson until it was inactivated in 1989.
Subsequently reactivated Dec. 15, 1995, at Fort Hood, Texas, the brigade led the Army's Force XXI experimentation and validation, shaping the force of the 21st Century.
The Warhorse Brigade has participated in many operations of the War On Terror, fighting to invade and secure Iraq as well as Afghanistan. In March 2003, the 2nd Brigade, 4th Infantry Division, deployed to the Middle East in support of Operation Iraqi Freedom. In late 2006, the 2nd Brigade Combat Team, 4th Infantry Division, moved from Fort Hood, Texas to Fort Carson, Colorado.
In 2003-2004, 2005-2007, and 2008-2010 the brigade deployed in support of Operation Iraqi Freedom. Meanwhile, 4th Brigade or “the Mountain Warrior Brigade” deployed in 2009, 2011, 2012, 2014, and 2016, to various regions of Afghanistan to further bring stability to the region. During this time, in 2015, the 4th Infantry Brigade Combat Team, 4th Infantry Division, was realigned under the 2nd Brigade Combat Team, 4th Infantry Division. The Department of the Army announced in 2018 that the 2nd Infantry Brigade Combat Team would be coverted to a Stryker brigade. The brigade's most recent deployment was to Afghanistan in 2018 where Warhorse Soldiers served on missions in Kandahar, Bagram, Dwyer, and Tarin Kowt in support of the Resolute Support Mission to train, advise, and assist Afghan National Defense Security Forces.