Breakthrough: The Great Martian War, Book 2

This is the second of the three-part series covering the opening salvo of the Great Martian Invasion. US forces recover from the initial shock of the Martian invasion of the Southwest and attempt to set up a defensive line along the Mississippi. The best minds in the US try to come up with ways to defeat the Martians using the little captured technology available to them. Meanwhile, President Roosevelt tries to rally world leaders to aid in stopping the invaders.