[Gotperl]

This is part of the plot by Armada by Ernest Client (which was also heavily influenced by Ender's Game)

[rglovejoy]

Also Footfall by Larry Niven and Jerry Pournelle. It even has a Robert Heinlein cameo.

[marktangotango]

That's such a great book, seems like also influenced the movie Independence Day, I don't have a source for that though.