Unfortunately, the high command hadn't counted on the Malach, a deadly alien race descending on Muir from the uncharted Gulf between the galaxies. A race that looks and acts remarkably like pack-hunting dinosaurs, the Malach destroy everything in their path. All that stands between them and the population of Muir is two obsolete Bolos with their weapons locked down....

A collection of stories about the indomitable Bolos, gigantic and indestructible robot tanks programmed to protect the human race, includes contributions by such authors as David Weber, S. M. Stirling, William R. Forstchen, and Linda Evans.

The Unconquerable continues the amplified history of the Bolo?an almost indestructible, nearly unstoppable tank controlled by a sophisticated artificial intelligence. These stories by S. M. Stirling, William R. Forstchen, Christopher Stasheff, Shirley Meier, Todd Johnson and more tell of the faithful and tireless protectors of the human race: the Bolos.