That is not something that can be added with the modkit. It's something that would have to be added by the game's dev himself, and it's something he's stated he has no intention of doing. Banished is a "survive against nature" thing, not a combat/military survival thing.

The closest that can be done is adding buildings, job descriptions and items/materials that have military names and uses, but it will never go further than that with a mod. It will be up to you to imagine that the "Soldier" who is producing rare items at the "Garrison" is actually bringing those back as spoils of war from raiding an imaginary neighbouring town.

引用自 kgujju：

Banished is perfect city building game I imagined but it is missing a vital ingredient which is build army, weapons and have competition to own land and resources. Plese add a mod for it.

You bought the wrong game then, it's never been marketed as anything other than what it is, a survival against nature. Buy tropico if you want that ♥♥♥♥.