Agree and disagree...
One, if withdrawing did not end a siege how could a siege be ended with destroying the sieging army to a man... And if you were the one attacking you could escape a bad sally just by withdrawing and the seige would still be there!! (Of course what happens to a large intact army which withdraws in good order is a completely different thread..)
But total agree on the towers thing... In any Seige (wood walls and massive stone ones) the AI can easily be tempted into range of the towers and will just stand there getting slowly killed off... I have seen it once back off a short distance after losing a lot of man, but it was not do anything else at the time... If you distract the AI and get it in close it will ignore casualties from the towers until it has taken sufficient caualties to rout it off the map...
All it has to do is stand a little futher from the walls when waiting for you... I mean it is one thing to get into position to pounce on any units coming out of the gate, but it really spoils the "willing suppension of disbelief" when the AI allows itself to be slaughter and routed by standing to close to some towers....
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