We love GATE because it is a military power fantasy of what its like if a Modern military destroy, humble, and embarrass an arrogant fantasy military. I love it as well. But I'm curious to see a story where both the modern and the fantasy military can go neck and neck. Like, if there's a battle between them, the victor could be either one.
The closest story I've found with this premise was "The Lost Regiment" novel series from the 90s where 500 US soldiers were isekai'd into a distant planet where they have to fight against a man eating 7-foot tall alien race that enslave the humans of that world. But it didn't really scratch the itch for me since the soldiers are from the American Civil War and the alien culture/military was based on the central Asian nomads. As such the series was very grounded and didn't open a lot of door for modern vs fantasy shenanigans. (Although, it is a fantastic book series, y'all should check it out.)
Anyway, does anyone know a fanfic or a GATE like story with that description?