Just a thought: you can't move past forts untill you siege them down. Wouldn't it be more realistic to be able to move past the forts, but you will get HEAVY attrition because obviously the supply lines have been broken. For example starting with 10% attrition going up 10% a month, and looting land past it will reduce it by 5% (or something). That would maybe give even more options to consider, although they WILL be very costly.
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