4. Army’s and Front’s operation zones

4.1. Concepts

• The armies are created to command and control units in some parts of the theater of war. They are consolidating the command of units and are not supposed to be overlapped.
• The enemy loves to attack between two armies (i.e., German at Sedan in May, 40, between the French 9e and 2e armées)

...

The entire rules is in the PDF file.