In The Battle of Adrianople: The Day Rome's Army Was Broken, Jack Whitaker tells the gripping true story of the disaster that shattered the legions of the late Roman Empire and marked the dawn of a new world. In August 378, on the sun-scorched plains of Thrace near modern Edirne, Emperor Valens led his eastern army against the Gothic tribes he believed he could crush. What followed was one of the most devastating defeats in Roman history, a day when imperial arrogance met its reckoning. Drawing on the account of Ammianus Marcellinus and other late Roman sources, Whitaker reconstructs the world of a fading empire: the weary legions marching under the summer heat, the desperate negotiations before battle, and the sudden, thunderous charge of Gothic cavalry that encircled and annihilated Rome's finest. He brings to life not only the chaos of the battlefield but the human cost, the fear, pride, and fatal misjudgment that sealed an emperor's fate. More than a chronicle of war, this book explores the deeper transformation that followed. It shows how the defeat at Adrianople broke more than an army; it broke the illusion of Rome's invincibility, forcing an empire to adapt, compromise, and survive in a changed world. It is a vivid, haunting portrait of the moment when ancient Rome's unshakable order gave way to uncertainty, and when the empire learned that endurance, not conquest, would be its only path to survival.