Hello Walter,
You don't have to look far back to see many examples of superior technology burying a far more powerful foe. For example, there are several cases where a handful of stringbag airplanes sank capital battleships.Stirling's "Island in the Sea of Time" is about bringing modern weapons to bronze-age battlefields.
I havn't readit but Harry Turtledove's book also runs that idea around: http://en.wikipedia.org/wiki/The_Guns_of_the_South
