Establishment and World War I
First Army was established on 10 August 1918 as a field army when sufficient American military manpower had arrived in France during World War I. As an element of the
American Expeditionary Forces (AEF) in the latter stages of
World War I it was the first of three field armies established under the AEF. Serving in its ranks were many figures who later played important roles in
World War II. First Army was inactivated in April 1919.
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 organizational structure for large military organizations that might be mobilized in time of national need.
First Army was located in the northeast United States and was activated on 11 September 1933 at
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
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 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 was followed by Major General
Fox Conner, First Corps Area commander and another AEF veteran and its Chief of Operations. In the years after World War I, 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, Conner retired.
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 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 a new command of the newly established
Eastern Defense Command, responsible for coastal and domestic defense. Drum retired in 1943 when he reached mandatory retirement age. General
George Grunert, commander of Second Service Command assumed command of First Army until Headquarters, First Army was activated in Bristol, England, in January 1944 under command of General
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
invasion of Normandy. Headquarters, First Army was activated In January 1944 at Bristol, England.
Upon going ashore on 6 June 1944,
D-Day, First Army came under General
21st Army Group (alongside the
British Second Army) and 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 made good progress, but
Omaha Beach came nearest of all of the five landing areas to disaster. The two American airborne divisions that landed 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 21st Army Group to the newly arrived
12th Army Group. First Army followed Third Army, the American armies forming the southern part of the encirclement of Germans at the
After capturing Paris (the
Wehrmachtbefehlshaber von Groß-Paris,
Dietrich von Choltitz, capitulated 25 August, ignoring Hitler's Trümmerfeldbefehl),
 First Army headed towards the south of the
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.
 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, 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
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
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
BRAC 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 deactivated its training divisions and reactivated them as separate training brigades under two commands.
First Army Division East, headquartered at
Fort George G. Meade, Maryland, 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 Hood, Texas, oversees units in all states west of the Mississippi River.
First United States Army was redesignated as First Army on 3 October 2006.