COS: taking fortresses (eg Leningrad).
Apart from massing the max amount of combat factors and the para's, there are a few other assets to use:
- Naval bombardment: will probably not kill strength point, but might affect morale
- Idem with Air: just keep attacking, despite the fact that the Air unit will lose strenght and not the defender. The defender *will* lose morale.
- Keep one or more Panzers behind the first line of attackers. After the 'combined' attack, move the Army/ Army group back and have the Panzers perform the 'single' attacks; despite low odds.
Basically, the way to overcome the defender in a frtress is not to destroy all the strength points, but to make the unit fail a morale check (leading to retreat or dissolve).
That's where the air and naval units are useful.
The panzer low-odds attacks are to create new morale checks on the defender.
von Schmidt