It’s not an awful conceit, but…
…if a bunch of plucky protagonists can make it from Point A to Point B with nothing but their wits and a little kinetic energy, then the goram USAF could have pushed the damn monsters back with a whole lot of kinetic energy, in the form of a bunch of A-10 Warthogs and their Happy Mandatory Fun Time GAU-Avenger rotary cannons. I mean: how could depleted uranium rounds do any worse than arrows, in this situation?
Oh, well, they’ll probably explain it away at some point.
Not sure where to ask this question, but I noticed that Chaosium currently has the Sweet Jenny card game from 7th Sea on sale. Is it worth a look?