Battle Earth V (Book 5). Battle Earth, #5

The fifth instalment of an epic science fiction series that tells of humanity's desperate struggle to survive against an overwhelming alien invasion. The alien invaders were crushed on Earth and driven to the edges of the Solar System, but the discovery of how they reached Earth uncovers a deadly threat that must be overcome. Major Mitch Taylor's Inter-Allied force, combined with masses of troops and a vast Navy, assembles to take the battle to the enemy in their own lands before they can recover from their losses.
But the enemy remains strong, and the fleet must not only survive, they must protect Earth from a second invasion force. Battle Earth is a futuristic sci-fi action adventure series that chronicles vast bloody battles following humanity's first reach into the stars.