This is book three of the Macht Trilogy,

The ferocious Macht states are united under Corvus. A generation past, ten thousand Macht marched into the Asurian Empire and out again becoming legend. Corvus' father led that march with Rictus as general, but Corvus intends to do more. Long years go into the planning and when he is ready he intends nothing less than the overthrow of the Asurian Empire.

Kearney blends the best of fantasy with military fiction. Want action? The blood flows like water. and the characters are real enough you are drawn in to their lives. I couldn't put it down. Definitely a book you'll want to collect as well as read. ~~ Pam Allan