
Originally Posted by
me
This is a well-known bug known as "the siege tower bug", which was introduced in its present form by RTW 1.5, probably in a half-assed attempt to correct the previous siege tower bug where men would occasionally fall down between the tower and the building. It's extremely annoying and hard to predict when it will happen, but apparently you can sometimes shake the affected unit out of its stupidity by repeatedly cancelling their orders (I think the hotkey is backspace) and then ordering them up onto the walls again until they get the idea.
CA apparently cannot be bothered to come up with a final patch for RTW to fix the stuff they messed up with the 1.5 patch (this, the Roman civil war bug, the messages bug), so the only solution is sadly to live with it and try to mitigate its effects by having plenty of alternative siege equipment.
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