The Hub: the Robot Army Trilogy (Volume 1)

Following yet another 'war to end all wars,' Earth is devastated and mankind is almost extinct. High-tech missiles and unimaginable bombs demolish cities and nations, annihilating millions and rendering the entire Earth virtually uninhabitable. As if that isn't enough, an alien force sweeps through the countryside and ruined cities, burning what is left to a crisp after stripping vast quantities of ore and minerals from the ground. A small band of survivors living underground in an old abandoned mine they named 'The Hub' begin to emerge, hunting for scraps and scavenging for their community. To their horror, they are faced with something that mounts yet another threat to their very survival. A vast army of robots and a fleet of strange flying craft land on Earth and begin erecting unusual structures that bodes no good for the hapless humans.