Hypothetically a border could have two large military forces in rather close range, but I would doubt that 2fort for was built with reality in mind. Wars constantly have (had?) close range combat inevitably (front lines), thus bayonets, trench spikes, shotguns, etc. All this being said, this is not reality, this is Brikwars. If you feel compelled to have a driving narrative as to why the two forces couldn't reconcile their differences over tea and crumpets, fine. If you just want to see groups of miniature plastic models wipe each other out, fine. If you want to equip a 3 story tall metal man with a giant crossbeam saber, fine. It's allowed!
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"Have I lied to you? I mean, in this room? Trust me, leave that thing alone." GLaDOS