The High Command frameworks below the Army High Command are the Army Groups (Heeresgruppenkommandos) that are formed for particular campaigns to control two to four Armies in a single Theater of Operations, or in an important and more or less self-contained sector under such a theater. Since 1941 the total number of army groups has been between four and twelve.
The chart further below (see figure 2) shows the variations in the number of Armies (Armeeoberkommandos) per army group, of corps per army and of divisions per corps.