Constantine XI and Mehmet II make their opening moves for the battle for Constantinople. Constantine begs for aid, which is slow to come from a medieval Europe inching ever closer to modernity. Mehmet is more proactive, constructing a massive new fort only six miles north of Constantinople itself. But, in the end, let's face it, this is all window dressing. The true conflict will be decided at the Theodosian Walls, which we here review.