The catch is combat is pretty lackluster right now (with the dev's admission) and there's no particular endgame but keep expanding and rising up Title Ranks.
There's only melee combat and I'm not sure the AI uses any specific tactics, albeit the mechanics for surrounding enemies, flanking, and breaking their morale is there. No ranged weapons like bows, crossbows, or siege engines, and defense structures boil down building walls (on which your troops can't currently walk on) and building doors and larger and more resistant doors.
I think dev has said something about improving all of this, but I'm not sure is at the forefront of the development. Right now the game is a decent city-building/management game,
Steam has a demo consisting of a (severely) outdated version of the full game. I say go try that one out and if you like the core design there pirate the cu8rrent version to test it out.