Concept

Army group

An army group is a military organization consisting of several field armies, which is self-sufficient for indefinite periods. It is usually responsible for a particular geographic area. An army group is the largest field organization handled by a single commander – usually a full general or field marshal – and it generally includes between 400,000 and 1,000,000 soldiers. In the Polish Armed Forces and former Soviet Red Army an army group was known as a Front. The equivalent of an army group in the Imperial Japanese Army was a "general army" (Sō-gun). Army groups may be multi-national formations. For example, during World War II, the Southern Group of Armies (also known as the U.S. 6th Army Group) comprised the U.S. Seventh Army and the French First Army; the 21st Army Group comprised the British Second Army, the Canadian First Army and the US Ninth Army. In both Commonwealth and U.S. usage, the number of an army group is expressed in Arabic numerals (e.g., "12th Army Group"), while the number of a field army is spelled out (e.g., "Third Army"). The French Army formed a number of groupes d'armées during the First World War. Army Group North, formed on a provisional basis in October 1914. Army Group East, created in 1915 Army Group Centre, created in 1915 Army Group Reserve was established in 1917. Army Group Flanders, created in September 1918 under the command of Albert I of Belgium, to conduct the Second Battle of Belgium as part of the Hundred Days Offensive. The German Army formed its first two Heeresgruppen in 1915, to control forces on the eastern front. A total of eight army groups would ultimately be raised – four for service on each front, with one of the eastern front army groups being a multinational German and Austro-Hungarian formation. Originally the Imperial German army groups were not separate formations, but instead additional responsibilities granted to certain army commanders. Crown Prince Wilhelm for instance, was simultaneously commander of the 5th Army and Army Group German Crown Prince from August 1915 to November 1916.

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Related concepts (10)
Military organization
Military organization or military organisation is the structuring of the armed forces of a state so as to offer such military capability as a national defense policy may require. In some countries paramilitary forces are included in a nation's armed forces, though not considered military. Armed forces that are not a part of military or paramilitary organizations, such as insurgent forces, often mimic military organizations, or use these structures, while formal military organization tends to use hierarchical forms.
Soviet Army
The Soviet Army or Soviet Ground Forces was the main land warfare uniform service branch of the Soviet Armed Forces from 1946 to 1992. Until 25 February 1946, it was known as the Red Army. In Russian, the term armiya (army) was often used to cover the Strategic Rocket Forces first in traditional Soviet order of precedence; the Ground Forces, second; the Air Defence Forces, third, the Air Forces, fourth, and the Soviet Navy, fifth, among the branches of the Soviet Armed Forces as a whole.
Field army
A field army (or numbered army or simply army) is a military formation in many armed forces, composed of two or more corps. It may be subordinate to an army group. Air armies are the equivalent formations in air forces, and fleets in navies. A field army is composed of 80,000 to 300,000 soldiers. Specific field armies are usually named or numbered to distinguish them from "army" in the sense of an entire national land military force.
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