Siege Units

[NTJedi]

Endoperez said:
Battering ram - useless on battlefield, needed to burst the gate in. What do you think the besiegers are doing? Siege towers would be really strange, as for some reason units can only attack through the gate.

Yes of course they'd be useless on the battlefield... their whole purpose is to storm the castle more quickly. The reason for their appearance on the battlefield is so that people trying to break the siege can destroy siege units.

Endoperez said:
Catapults are probably trivial to mod in, after all, Boulders already exist. They can fly as far as you want, as long as you increase the catapult's strength. The stronger it is, the better it is at breaking castles.

Not just boulders perhaps flaming boulders as well or perhaps it can toss an animal which spreads disease. Different catapults for different nations as well.

Endoperez said:
Sappers, Siege Engineers, Golden Era down-to-earth engineer/philosophers (whatever they are called), and on the other hand, Guardians, Ghoul Guardians, Man's Tower Guards, C'tissian City Guards etc have been enough for both Dom:PPP and DomII.

Yes but those are all units with two feet also siege units such as battering rams, catapults, and siege towers were used on castles in history... I see no reason they can't be used on castles within Dominions which takes many units from history.