George S. Patton, who served as the first headquarters commandant for the American Expeditionary Forces, oversaw much of the arrangements for the movement of the 1st Division to France, and their organization in-country.

This victory was mainly due to the efforts of Colonel George C. Marshall, who began the war as the division's deputy chief of staff before being elevated to G-3 for the entire AEF in July 1918.

Rags achieved notoriety and celebrity as a war dog, after saving many lives in the crucial Argonne Campaign by delivering a vital message despite being bombed and gassed.

The next major training event for the division came in August 1935 when the First and Second Corps Area elements of the First Army were assembled at Pine Camp for small unit maneuvers.

Shortly afterward, in September 1937, the division, minus the 2nd Infantry Brigade and some field artillery units, was concentrated at Indiantown Gap Military Reservation, Pennsylvania, for maneuvers.

Concurrently, the 2nd Infantry Brigade, reinforced by the artillery units from Fort Ethan Allen and Madison Barracks, New York, assembled at Pine Camp for maneuvers.

As part of its training that year, the division participated in both Carolina Maneuvers of October and November before returning to Fort Devens, Massachusetts on 6 December 1941.

Within a week, the division was returned to its former post at Fort Benning, Georgia, from where it was expedited on 21 June 1942 to Indiantown Gap Military Reservation for wartime overseas deployment final preparation.

[17] Elements of the division then took part in combat at Maktar, Tebourba, Medjez el Bab, the Battle of Kasserine Pass (where American forces were pushed back), and Gafsa.

[6] The 1st Division then attacked east of Aachen through the Hürtgen Forest, driving to the Ruhr, and was moved to a rear area 7 December 1944 for refitting and rest following 6 months of combat.

When the German Wacht Am Rhein offensive (commonly called the Battle of the Bulge) was launched on 16 December 1944,[6] the division, now commanded by Major General Clift Andrus, was quickly moved to the Ardennes front.

Thereupon, the division, now commanded by Major General Clift Andrus, attacked and again breached the Siegfried Line, fought across the Ruhr, 23 February 1945, and drove on to the Rhine, crossing at the Remagen bridgehead, 15–16 March.

The division broke out of the bridgehead, took part in the encirclement of the Ruhr Pocket, captured Paderborn, pushed through the Harz Mountains, and was in Czechoslovakia, fighting at Kynšperk nad Ohří, Prameny, and Mnichov (Domažlice District) when the war in Europe ended.

1st Infantry Division Artillery, including 4-3 FA battalion, was decisive during combat operations performing multiple raids and fire missions.

These combat operations resulted in the destruction of 50 enemy tanks, 139 APCs, 30 air defense systems, 152 artillery pieces, 27 missile launchers, 108 mortars, 548 wheeled vehicles, 61 trench lines and bunker positions, 92 dug-in and open infantry targets, and 34 logistical sites.

[30]There was also the "bulldozer assault", wherein the 1st and 2nd Brigades from the 1st Infantry Division (Mechanized) used mine plows mounted on tanks and combat earthmovers to bury Iraqi soldiers defending the fortified "Saddam Line."

While approximately 2,000 men surrendered, escaping death, one newspaper story reported that U.S. commanders estimated thousands of Iraqi soldiers had been buried alive during the two-day assault over the period 24–25 February 1991.

The division opened three seaports, two airports, three command posts, and convoy support centers along a 500-mile route from the Turkish coast, through Mardin, to the Northern Iraqi border.

When the Turkish government voted to deny US ground forces access to Turkey, ARFOR-T collapsed the line of communication and redeployed to Germany home stations in April 2003.

In February 2007, the 4th Infantry Brigade Combat Team deployed to southern Baghdad in support of Operation Iraqi Freedom, becoming The second unit tasked with the "surge" announced earlier in the year by President Bush.

The main focuses of the brigade and PRT were to protect population centers such as Jalalabad and Asadabad and help develop the local economy through the construction of roads, and provide security while doing so.

Hood, Texas in July 2009 after a year of combat in which they recorded over 2000 firefights, over 3000 enemy killed, over 1000 bombs dropped, 26,000 rounds of artillery fired and over 500 Purple Hearts awarded.

2nd Heavy Brigade Combat Team deployed to Baghdad, Iraq in November 2010 in an advise and assist role as part of Operation New Dawn under the command of COL Paul T. Calvert.

The Special Troops Battalion, commanded by LTC Shilisa Geter, was located at VBC (Victory Base Complex) and partnered with the Baghdad Police Directorate.

Significant events during this deployment included the resumption of attacks by the Sadrist movement and other Iranian-backed militia, the subsequent operations that stopped those attacks, the rearward passage of lines of USD-North as they redeployed through Baghdad, the organization and training of divisional field artillery regiments for the IA divisions, the fielding of M1 tanks for the 9th IA Division, and the hand-over of all US facilities within Baghdad to the Government of Iraq or elements of the US State Department.

The brigade experienced nine KIAs during this deployment, the majority of which resulted from a single IRAM attack (improvised rocket-assisted munition) conducted against JSS Loyalty by Iranian-backed militia on 6 June 2011.

Tofan I's mission was to disrupt insurgent safe havens in the Musa Khel region of Khowst Province, improve the ability for the government to reach the people there and gather intelligence for planning future operations.

[38] The division served as the Combined Joint Task Force-1 (CJTF-1) and RC(E), command and controlling the vital region (Bamiyan, Parwan, Panjshayr, Kapisa, Laghman, Nuristan, Konar, Nangarhar, Maiden Wardak, Logar, Paktiya, Khowst, Ghazni, and Paktika) surrounding Kabul and a large portion of the volatile border with Pakistan.

[40] In response to the growing ISIL threat the Department of Defense announced on 25 September 2014 that approximately 500 soldiers from the 1st Infantry Division Headquarters will be deployed to Iraq with the task of assisting Iraqi Security Forces.

[44] The unit deployed in September 2017 and redeployed in June 2018, serving throughout Eastern Europe conducting readiness and inter-operability training with NATO Allies to assure U.S.