Well squads aren't armies if you've mistaken them for being fortress militia squads, since armies are going to take up a different thing altogether also detailed on the dev notes than the group party squad coming in the next release which to our current understanding can be armed but also composed full of civilians.
I did confuse squads and armies, but the suggestion still stands.
From the dev logs it seems armies come to our fortresses and we send out squads.
From 03/18/2017
We have little missions for groups of squads, and they can leave the map now. The current possibilities are rescue missions for kidnap victims, artifact recovery missions, and generic raids if you just want to start trouble. There are myriad issues to sort out, as expected. I'll let you know if anything amusing happens!
Having a persistant watch might come with having a army out in the world but nothing yet i think, the only races to currently patrol are elves via entity tags and that'll make them wander randomly through territory they "own"
Now we could send armies out we could patrol the territory we own.
- Firstly its definitely not going to halt or hinder the numbers of all but the smallest armies and groups depending on how well armed your squad is, a devastating attack might buy you time but its not quite a replacement for having a army or killing them on the defences.
At some point in a fortress's life dwarves become expendable. As you send them out have an option 'engage' or 'scout'.
- there's additional things like logistics too that might make 24/7 patrolling a little troublesome for dwarves unless the army camp has its own food/drink supply...
Dwarves already have backpacks and flasks for food and drink. There's already tents. Since armies can have civilians too--the civilians can be porters or squires carrying provisions. A simple algorithm taking in account the skill levels in hunting, plant gathering, and ect would help with food and drink.
- Groups being sent off in the next release are expected to return so it might be ineffective unless theres some controls on how to set the points of their journey to navigate through.
I wander if the army could be held abstractly in the region and probability plus an algorithm would tell if they see a FB or an invading army or if the FB/foreign army sees them.