Regarding tanks stuck in the mud: What's the standard tactics for a defender?
They would be great to use against the attacker, but to do that you'd have to get them out of the mud which by definition can't be an easy task or they wouldn't be stuck.
If you just leave them, they might get rescued at some point so that's not a good strategy
Do you just take anything movable and/or interesting, unload the ammunition maybe then try to destroy them in place? And how would you do that? Rip out the wiring, pour petrol inside and ignite it? put sand in the fuel tank?