Hahaha, awesome plot. I have always imagining what it would be like a reaction of for instance, the American revolutionaries encountering an army equipped with automatic rifles, snipers and tanks.

That would be a sight to see.

EDIT: 7:40 of the video of Veho Nex. that's exactly what I meant. A group of Confederate soldiers being pinned down by machine gun fire. They surely would be "WT* is shooting at us with such a speed???"
I suggest you look up the name Harry Turtledove.