Some missions like Saladin 6th or Hautevilles 4th aren’t really tower defense, as that’s the worse way to win.
Edward Longshanks 2 is not hard or towers reliant.
The Almeida one is also short term.
Pachacuti 2nd forces you into defense mode, so it’s valid.
Vlad 4 is another I can think of.
Bari 3/5 are similar to ELongshanks that you spend most of the mission doing objectives outside the wall.
The most tiring but awesome TD mission I have played is Alaric final (at least for the coop one, I haven’t played solo) if you don’t kill Saurus first.
The endless Goths spam makes it really hard to push on Orange.
Edit: Oh don’t forget the infamous Leloi 2.
It’s true TD, but only for half the mission.