Establishment and World War I

The First Army was established on 10 August 1918 as a field army when sufficient American military manpower had arrived on the Western Front during the final months of World War I. The large number of troops assigned to the American Expeditionary Forces (AEF) required the activation of subordinate commands. To fill this need, First Army was the first of three field armies established under the AEF. The first commander was General John J. Pershing, who also served as Commander-in-Chief (C-in-C) of the AEF. The headquarters planned and directed the first major American offensive, the St Mihiel Offensive (September 12 to 16, 1918).^[7] It later went on to fight in the largest and deadliest battle in the United States Army's history, the Meuse–Argonne offensive. Serving in its ranks throughout World War I were many figures who later played important roles in World War II. First Army, now under Lieutenant General Hunter Liggett, was inactivated on April 20, 1919, five months after the Armistice with Germany which ended hostilities.^[7]

Inter-war years

As part of an army reorganization and final realization of the 1920 amendment to the National Defense Act of 1916, Army Chief of Staff, General Douglas MacArthur directed the establishment of four field armies that each commanded three corps areas that were geographically located. The field armies were established to provide an organizational structure for large military organizations that might be mobilized in times of national need.

First Army was located in the northeast United States and was activated on 11 September 1933 at Fort Jay, Governors Island, New York. Initially activated as a paper army, it was commanded by General Dennis E. Nolan. Until 1942, First Army's commander was always the senior commander of one of its three corps areas. The First Corps Area was headquartered in Boston, Massachusetts, Second Corps Area was headquartered at Fort Jay, Governors Island, in New York, New York, and Third Corps Area was located at Fort Howard (Maryland) near Baltimore, Maryland. Since First Army was only a paper organization in its early days, its staff was the existing staff of the corps areas. The overall mission of the First Army was commanding and training the regular army, army reserve and national guard units in the three corps areas.

Nolan, the American Expeditionary Force's (AEF) chief of intelligence during World War I, commanded First Army from 1933 to 1936. He was followed by Major General Fox Conner, previously First Corps Area commander, who had been the AEF's Chief of Operations in World War I. In the years between the wars, Conner was a crucial mentor in the careers of Dwight Eisenhower and George C. Marshall. Passed over as a candidate for Army Chief of Staff for Douglas MacArthur in 1930, Conner was assigned to command the First Corps Area instead, later commanding First Army in 1936. Conner retired in 1938.

In 1938 First Army came under command of General Hugh A. Drum. Drum, who along with a buildup of the Army in 1939 and through the early 1940s, began to develop the First Army into a bona fide field army. It began to establish and develop its own staff and participated in the large-scale Army maneuvers in Louisiana and North Carolina between 1939 and 1941. As the United States entered World War II, Drum was assigned command of the newly established Eastern Defense Command, responsible for coastal and domestic defense, which relieved the First Army of this responsibility on 24 December 1942. Drum retired in 1943 when he reached mandatory retirement age. General George Grunert, commander of Second Service Command, assumed command of the First Army until Headquarters, First Army was activated in Bristol, England in January 1944 under command of General Omar Bradley.

World War II

First Army's entry into World War II began in October 1943 as Bradley returned to Washington, D.C., to receive his command and began to assemble a staff and headquarters to prepare for Operation Overlord, the codename assigned to the establishment of a large-scale lodgement on the European Continent following Operation Neptune, which was the invasion of Normandy. The headquarters were activated in January 1944 at Bristol, England.

Upon going ashore on 6 June 1944, D-Day, First Army came under General Bernard Montgomery's 21st Army Group (alongside the British Second Army) which commanded all American ground forces during the invasion. Three American divisions were landed by sea at the western end of the beaches, and two more were landed by air. On Utah Beach, the assault troops of VII Corps made good progress, but V Corps on Omaha Beach came nearest of all of the five landing areas to disaster. The two American airborne divisions that landed, the 82nd and 101st, were scattered all over the landscape, and caused considerable confusion among the German soldiers, as well as largely securing their objectives, albeit with units completely mixed up with each other. First Army captured much of the early gains of the Allied forces in Normandy. Once the beachheads were linked together, its troops struck west and isolated the Cotentin Peninsula, and then captured Cherbourg. When the American Mulberry harbour was wrecked by a storm, Cherbourg became even more vital.

After the capture of Cherbourg, First Army struck south. In Operation Cobra, its forces finally managed to break through the German lines. The newly established Third Army was then fed through the gap and raced across France.

With the arrival of more US troops in France, the Army then passed from the control of the 21st Army Group to the newly arrived 12th Army Group which commanded the First Army and the newly formed Third Army under Lieutenant General George S. Patton. General Bradley assumed command of the 12th Army Group and Lieutenant General Courtney Hodges was placed in command of the First Army. First Army followed Third Army, the American armies forming the southern part of the encirclement of Germans at the Falaise pocket.

After capturing Paris (the Wehrmachtbefehlshaber von Groß-Paris, Dietrich von Choltitz, capitulated 25 August, ignoring Hitler's Trümmerfeldbefehl),^[8][9] During the Battle of the Mons Pocket VII Corps took approximately 25,000 prisoners.^[10] First Army headed towards the south of the Netherlands. First army liberated most of Luxembourg in three days from 9–12 September 1944.

When the Germans attacked during the Battle of the Bulge, First Army found itself on the north side of the salient, and thus isolated from 12th Army Group, its commanding authority. It was, therefore, temporarily transferred, along with Ninth Army, back to 21st Army Group under Montgomery on 20 December.^[11] The salient was reduced by early February 1945. Following the Battle of the Bulge, the Rhineland Campaign began, and First Army was transferred back to 12th Army Group. In Operation Lumberjack, First Army closed up to the lower Rhine by 5 March, and the higher parts of the river five days later.

On 7 March, in a stroke of luck, Company A, 27th Armored Infantry Battalion, part of Combat Command B, 9th Armored Division, found the Ludendorff Bridge across the Rhine at Remagen still standing. It quickly captured the bridge and established a secure bridgehead. in the next 15 days, over 25,000 troops and their equipment crossed the river. By 4 April, an enormous pocket had been created by First Army and Ninth Army, which contained the German Army Group B under Field Marshal Model, the last significant combat force in the northwest of Germany. While some elements of First Army concentrated on reducing the Ruhr pocket, others headed further east, creating another pocket containing the German Eleventh Army. First Army reached the Elbe by 18 April. There the advance halted, as that was the agreed demarcation zone between the American and Soviet forces. First Army and Soviet forces met on 25 April.

In May 1945, advance elements of First Army headquarters had returned to New York City and were preparing to redeploy to the Pacific theater of the war to prepare for Operation Coronet, the planned second phase of Operation Downfall the proposed invasion of Honshū, the main island of Japan in the spring of 1946, but the Japanese surrender in August 1945 thanks to the atomic bombings of Hiroshima and Nagasaki terminated that effort.

Post-war and peacetime missions

First Army returned to the United States in late 1945; first to Fort Jackson (South Carolina), then to Fort Bragg, North Carolina, returning to Fort Jay, Governors Island, New York, in the spring of 1946. Twenty years later, in 1966, First Army relocated to Fort Meade, Maryland, and took over the responsibilities of Second Army, which was inactivated. In 1973, First Army's mission changed from training and preparation of active units to Army Reserve units. In a 1993 reorganization, five divisions carried out that training and support mission:

75th Division, Houston, Texas

78th "Lightning" Division, Edison, New Jersey

85th "Custer" Division, Arlington Heights, Illinois

87th "Golden Acorn" Division, Birmingham, Alabama

91st "Wild West" Division, Dublin, California

In 1993, Headquarters First Army relocated to Fort Gillem, near Atlanta, Georgia, and became responsible for the training and mobilization of all Army Reserve and National Guard units in the United States and providing assistance to the civilian sector during national emergencies and natural disasters. In the latter role, First Army's contributions during the 2005 Hurricane Katrina disaster was a rare bright spot in leading federal relief efforts in the aftermath of the storm. Its commander, Russel L. Honoré, a Louisiana native, became a nationally recognized figure in his direct, no-nonsense approach to disaster relief which earned First Army a Joint Meritorious Unit Award.

In the 21st century, First Army was subjected to more changes as base closures and force structures were instituted to modernize, economize and change its mission. In 2005, a Base Realignment and Closure (BRAC) Commission decision called for the relocation of First Army headquarters to Rock Island Arsenal, Illinois, in 2011. Its former quarters at Fort Gillem was to transition to a single national location for the mobilization and demobilization of Army National Guard and Reserve units.

In a second change, as part of the 2006 reorganization of the United States Army program, First Army exchanged its civilian assistance mission for the training and support missions for military units in the western United States formerly held by US Fifth Army. Fifth Army then became U.S. Army, North with responsibilities for homeland defense and domestic emergency assistance.

First Army inactivated its training divisions and reactivated them as separate training brigades under two commands. First Army Division East, headquartered at Fort Knox, Kentucky (relocated from Fort Meade, Maryland in 2016), has responsibilities in all states east of the Mississippi River; and First Army Division West assuming Fifth Army's role and relocating from Fort Carson to its new headquarters at Fort Cavazos, Texas, oversees units in all states west of the Mississippi River.

First United States Army was redesignated as First Army on 3 October 2006.

Shoulder sleeve insignia

• Description: On a background equally divided horizontally white and red, 3+1⁄4 inches high and 2+1⁄2 inches wide at base and 2+1⁄8 inches wide at top, a black block letter "A", 2+3⁄4 inches high, 2 inches wide at base and 1+5⁄8 inches wide at top, all members 7/16 inch wide, all enclosed within a 1/8 inch Army Green border.
• Symbolism:

1. The red and white of the background are the colors used in flags for Armies.
2. The letter "A" represents "Army" and is also the first letter of the alphabet suggesting "First Army."

• Background:

US Army 1st Army Shoulder Sleeve Insignia Prior to 1950 red and white background

1. A black letter "A" was approved as the authorized insignia by the Commanding General, American Expedition Force, on 16 November 1918 and approved by the War Department on 5 May 1922.
2. The background was added on 17 November 1950.

Insignia

• Description:

1. A gold color metal and enamel device 1+1⁄4 inches high overall consisting of a black enamel capital letter "A" bearing three gold stars on the top cross bar and five gold on the center cross bar, in front of and interlaced with a gold fleur-de-lis.
2. The vertical petal is charged in base with a red enamel arrowhead behind and extending above the letter "A" and the tops of the two outside or flanking petals above the cross bar extending over the vertical legs of the letter "A".
3. The lower ends of the outside petals curve under and over the lower ends of the vertical legs of the letter "A" and are joined by a gold arched scroll inscribed "First In Deed" in black enamel letters.
4. The areas within the letter "A" above the center cross bar are white enamel and the areas below the cross bar are red enamel.

• Symbolism:

1. The basic design was suggested by the authorized shoulder sleeve insignia of the First Army.
2. The Interlaced fleur-de-lis represent wartime service in France and alludes to the initial organization of the Headquarters Company as the Headquarters Troop, First Army at La Ferte-sous-Jouarre, France 10 August 1918.
3. The three stars at the top of the letter "A" are for Lorraine 1918, St. Mihiel and Meuse-Argonne campaigns in which the First Army participated in World War I.
4. The five stars on the center cross bar are for the Normandy, Northern France, Rhineland, Ardennes-Alsace and Central Europe campaigns in which the First Army participated in World War II, the red arrowhead referring to the assault landing on the Normandy beaches.
5. The motto "First In Deed" is based on the numerical designation, purpose and achievements of the First United States Army.

• Background: The insignia was approved on 27 January 1969.

Campaign participation credit

Conflict	Streamer	Year(s)
World War I	St. Mihiel	1918
	Meuse-Argonne	1918
	Lorraine 1918	1918
World War II	Normandy (with arrowhead)	1944
	Northern France	1944
	Rhineland	1945
	Ardennes-Alsace	1944–1945
	Central Europe	1945

Decorations

Ribbon	Award	Year	Orders
	Joint Meritorious Unit Award	2005	For leading the federal response to Hurricane Katrina 2005.[12]
	Army Superior Unit Award	2001–2004	Lineage & Honors Statement 30 April 2012[13]
	Army Superior Unit Award	2004–2008	Permanent Orders 120-10 30 April 2009[14]
	Army Superior Unit Award	2008–2011	Permanent Orders 332-07 announcing award of the Army Superior Unit award

Current

First Army Division East – Fort Knox, Kentucky^[16]

4th "Saber" Cavalry Brigade – Fort Knox, Kentucky. Formerly the 85th Division's 4th Brigade.

157th "Spartan" Infantry Brigade – Camp Atterbury, Indiana. Formerly the 87th Division's 5th Brigade.

174th "Patriot" Infantry Brigade – Fort Dix, New Jersey. Formerly the 78th Division's 2nd Brigade.

177th "Mudcats" Armored Brigade – Camp Shelby, Mississippi. Formerly the 87th Division's 3rd Brigade.

188th "Battle Ready" Infantry Brigade – Fort Stewart, Georgia. Formerly the 87th Division's 4th Brigade.

First Army Division West – Fort Cavazos, Texas^[17]

5th Armored Brigade – Fort Bliss, Texas. Formerly the 91st Division's 2nd Brigade.

120th Infantry Brigade – Fort Cavazos, Texas. Formerly the 75th Division's 2nd Brigade.

166th Aviation Brigade – Fort Cavazos, Texas. Formerly the 75th Division's 3rd Brigade.

181st "Eagle" Infantry Brigade – Fort McCoy, Wisconsin. Formerly the 85th Division's 2nd Brigade.

189th "Bayonet" Infantry Brigade – Fort Lewis, Washington. Formerly the 78th Division's 4th Brigade.