I'm trying to recall the title of a book involving time travel. It included warriors from different time periods being given modern technology. The Hordes of Genghis Khan were like a biker gang riding around on Harley Davidsons. Roman Legionaries were attacking with anti-tank weapons.
My question is: Do you recall a book involving time travel, hordes of genhis khan riding harleys, and centurions with anti-tank weapons?