Books Like Behold Humanity!: May We Come In?By Ralts Bloodthorne

The Unified Civilized Council, which has ruled for over a hundred million years has discovered new species in the Long Dark. Strange and unknown species that seem to have no rhyme or reason about them. Compounding the problem is the reappearance of the ancient Precursor Autonomous War Machines. Even worse is the fact that the newly discovered Terran Confederacy of Aligned Systems appear to be the only force capable of stopping the murderous robotic starships, some the size of small continents.

The first book in the Behold Humanity! series, this covers the initial meetings as well as the initial battles between the living and the terrible machines.