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An army-group is a military organization consisting of several armies, and is supposed to be self-sufficient for indefinite periods.
The borders of the area for which an army group is responsible are usually geographically ones.
Army group is a term used in Germany. In the Soviet Union the same thing was called a "front".
The army-group (lowercase a) is not to be confused with an (uppercase A) Army, e.g. The Free Country Army could be composed of the First, Third, and Ninth armies.