Now that's a story I want to hear about. Best I can boast of is defeating 800 Vlandians with ~600 of my own, and it was by taking advantage of the bottleneck by the beach in the battle scene near Geronter Castle (west of Ortysia City) and having more high quality troops once the initial enemy wave was defeated lol. Otherwise I prefer the Sun Tzu approach of always outnumbering my enemies and avoiding any battle I'm not fully certain I can win lol. EDIT: Well, now that I remember, I did defend Quyaz with a few hundred city defenders against a couple Vlandian armies ranging from 1-2,000 lol, but that's because the A.I.'s easy to exploit by shooting their sides as they come down the stairs on the city side of the wall rather than me being clever. In other words, it's like thwacking guys on the head at the top of the ladder in Warband; it's just set up to be played like that lol, highly favorable to defenders. I ultimately lost to the third group that decided to ram the gate because, once it got to a straight up melee, we stood no chance! Very painful defeat lol, got arrested and everything even as a monarch! Couldn't force a peace until I was RNG'd out of jail, just in time to prevent Ain Baliq Castle and my own Senala City from being attacked.
I suspect lots of people who play games like this have studied tactics to some degree simply because... if you like the idea of leading troops into battle and roleplaying as Zhuge Liang or Shingen Takeda or Carolus Rex, you probably know at least one or two things about some unit tactics.