Dragonvein: Book One — Brian D. Anderson

Carentan, France 1944 - Ethan Martin, a soldier in the 101st Airborne, is fighting for his life. But soon he will learn what peril truly is when he is ripped from his world and transported to a land of magic, swords, and dragons. And though the Nazis are now far, far away, danger is closer than ever. The Eternal Emperor, Shinzan has destroyed the mages and only a few dragons remain in exile. And now that Ethan, son of Praxis Dragonvein, has returned he must destroy him as well. Faced with unimaginable power, Ethan has only one hope - to reach the dwarf kingdom of Elyfoss before Shinzan can find him.