Here's a thread. If you haven't read it already, follow the link to Frogbeastegg's guide, good reading.
https://forums.totalwar.org/vb/showthread.php?t=40554
Wall collapse with troops on it, got a screenshot? I wonder if you can collapse your own walls (as a defender). Damage it some, wait for the enemy to take the wall, then bring it down. Got to try that in a custom battle...
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