Will building more armories decrease difficulty levels? It makes sense because you'll have more troops. Unfortunately, I don't have the room to build 25 armories.
Sorry Tauriel, I think you are misunderstanding the concept. Your squadsize determines how many of your troops face the enemies troops....it doesnt matter if you have 1000, or 10,000 troops to fight with. If your current squad size is say, 100, then @1000 you have 10 squads. Battles are always about your troops squadsize vs their troops squadsize. If they have a bigger squad than you, then you are usually at a disadvantage from the get-go.
Troops are also rated with stars, 1, 2 and 3. If you have all 1 stars going against all 2 stars, then even having a larger squadsize may not matter.
Now with that being said, The difficulty level, on the main province map, is determined by your scouting costs, which decrease at the start of each new chapter, AND your squadsize updates in the tech tree.. Each time you start a new chapter and unlock the new scouts, the difficulty level on the main map will decrease somewhat, in some areas. Each time you upgrade your squad size, the same thing will happen. After all, what was hard with 100 troops wont be AS hard with 125.
In my case, most of the Hard provinces I had scouted prior to reaching chapter V, turned into MED provinces as soon as my scouts were unlocked at the beginning of chapter V. The concentric rings on the province map will always work like that, from Easy, Med, Hard, and Very Hard. I believe this is to prevent players from just grabbing up provinces willy-nilly, which I did in the beginning, and still like to do.
In my opinion, you have 2 choices on the province map, you either wait to take provinces until you can beat them in a fight, or you set your city up to mass produce goods(my approach) and take provinces whenever you can afford the goods.
All the armories allow you to do is TRAIN more units in the same amount of time. I dont have a lot of need for 2x2 plots at the moment, so I use armories as a place holder. If I need to add a new residence, I remove 1. I didn't see the need for those spaces to be wasted.
As with anything new, you'll have to experience it to form your own conclusions. Trial and error is the best teacher., IMO Happy gaming.
I hope the above information is correct, and it helps you. If it isn't, someone here will correct me.