Colonial Charter (CC 1.75 is the correct current version, others are outdated) has a "Fort" theme series of buildings in it. Some of them produce random stuff, but it's mostly decorative as combat or crime cannot be added to the game.
The "soldiers" are actually just average workers that produce a range or random items with their building's description telling you it's loot brought back from enemy land. Gotta use our imagination a bit, but you can definitely build a town that looks fortified.

RedKetchup also has medieval walls/towers in some of his mods. You can find them on worldofbanished.com

thanks. id like to see someone dig into the code and put something there tho. could you imagine an rts game with this level of micromanagement

There are already lots of games with both city-building side and combat stuff, I'm happy with Banished not having any kind of exterior threat other than the natural ones.

Adding combat couldn't be done with the modkit, you'd need to go and hack the engine Luke made for his game. Not something people in the modding community are interested in doing. They're pretty happy stretching the modkit's limits to the max, always wondering if/how they'll break things, but not touching the game itself. :p

Forest Village was pretty much a Banished clone with combat when it was launched. I'm not sure how well it's doig now. Last I checked it had some pretty incoherent stuff (like babies appearing in random houses where only 3 boys aged 3 to 7 lived for example) and had some bugs, but that was a while ago.