Megawar of the Worlds — David Cian

In this futuristic novel it is 2038, a century since the last invasion from the Red Planet, and humanity has studied the confiscated Martian technology and found new uses for it. One of these uses is to create giant robots piloted by men and women dedicated to protecting the planet. With these super robots, the inhabitants of Earth think they are ready for the invasion, but the Martians have made a number of improvements on their technology over the last century. Megawar of the Worlds is a giant-robot adventure.