moral of the story: Never ever even think of messing with modern technology, because you probably won't know what happened even much after it already happened (especially if you mainly depend on only magic and/or medieval-era tools)
Yeah... no.
Ever watched Those Who Hunt Elves? An old Type-74 played havoc against medieval armies and even took down a golem the size of a skyscraper.
And now they're facing a platoon of Type-10 tanks.