Campaign tactics - zone breakthroughs and deployments

[enrique]

If there's no "breakthrough" deployment rule in Cassino, how does Cassino handle it when the attacker enters a new zone?

Rule 8.2 Target Area of Cassino Campaign game:

"When a player gives a battalion or support unit an attack order, he also specifies one enemy-controlled area which that battalion or support unit will attack... It may not enter or fire upon any hexes of any other area".