City assaults are the worst option me thinks. I would lay siege until they comes out. My spies 360 degrees around me reporting enemy relief forces and destroy them before get any chance. If I see an enemy general close by I hire every single mercs to drain the merc pool. It doesn't matter the mercs fight or not. Usually my expedition forces made of 3 full stacks with 2 family members. Able to conduct war without need of reinforcements. sometimes I lift the siege and besiege it again to starve them longer to reduce their manpower because I don't take chances. Besieging is another way of disrupting enemy forces. They will not stop sending troops to save their city. You just hold some strategic position like mountain pass, bridge or higher ground to anhilialate them with your another army.
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