Warlords of Cunaxa (Star Legions: The Ten Thousand Book 3). Star Legions: The Ten Thousand, #3

Xenophon and his comrades have proven their worth, and now the combined fleets of the Black Legion and their allies are poised to end the conflict. Both sides have mobilised every warrior and ship they can, for what will be a final apocalyptical battle between the Terrans and the Emperor himself. The titanic forces of both sides meet at the critical world of Cunaxa Secundus, just a few worlds away from the Imperial capital of Babylon Prime.
The most powerful warlords of a hundred worlds assemble for war with legions of soldiers, war machines, and creatures from every corner of the Empire to defend their God King. Against them stand the Laconian general, Clearchus and his paymaster Lord Cyrus, the usurper who seeks to free the Empire from his brother's reign. Their combined forces includes hundreds of warships, and of course, the Black Legion, a horde of unbeatable Terran mercenaries.
The battle of Cunaxa will determine not just the future of Xenophon and his friends, but also set the course of history for the next thousand years. Warlords of Cunaxa is the third book in the Star Legions series from Michael G. Thomas, the bestselling author of the Star Crusades series. Previously published as the Black Legion series.