Actually, not only have 'humans been fighting wars for a long time', the entire idea of maneuver warfare predates both Ender's game _and_ it making its way into US army literature.

And this you can surmise not by digging up some obscure work from a library but simply by reading the wikipedia page.

http://en.wikipedia.org/wiki/Maneuver_warfare http://en.wikipedia.org/wiki/Maneuver_warfare#Development_of...

The notion that Ender's game, whatever one might think of its merits, was somehow an early and unrecognized insight into maneuver warfare is ludicrous and silly.