Harry Turtledove 
Thousand Cities [EPUB ebook] 

As the sun gleamed off the gilded domes of Videssos the city, Abivard, marshal of Makuran and son of Godarz, pondered the impossible. How could he carry out the command of Sharbaraz, King of Kings, to destroy the invincible Empire of Videssos? Then, against all expectations, the Emperor of Videssos invaded Makuran itself. Abivard was thrust on the defensive, forced homeward to drive the invaders from the fabled land of the Thousand Cities. Abivard needed not only his greatest battle skills but his most powerful magicians, for no one doubted that Videssian military strategy would be accompanied by the finest sorcery. Yet even as reality reversed itself and renegades plotted Abivard’s ruin, the undaunted warrior vowed never to surrender…