The lack of warmachines is something I have always wondered about in the armybooks. In my wargaming days, the chaos army was allowed to field rams and simple catapults. These were dressed up with chaos 'decorations' kit-bashed from spare soldier bits.
I know it's not canon...but it's a thought
The siege element will be interesting for Chaos factions. They will need to rely on rams to take out gates, and siege towers and ladders to scale the walls and storm them hand to hand. There is no real need to give them catapults to just bombard the enemy form a distance. Chaos doesn't approve of such cowardly tactics. Get in close and fight hand to hand.
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