Henry’s son, Otto “The Great” mustered the largest heavy cavalry force of his time, which numbered around a thousand. Otto won a major battle against the Magyars in the Battle of Lechfeld of 955. Otto’s force was heavily outnumbered, but he possessed a tactical advantage in that the majority of his army was heavy cavalry. The Germans approached the Magyar forces in column, and the mobility of their cavalry prevented the magyars from enforcing their usual tactic of encircling the enemy and attacking the rear. Another instance in which this new heavy cavalry proved useful in battle was the reign of Duke William of Normandy. His main striking force in all his battles was heavy cavalry. In October 1053, he ended Henry I’s first invasion of normandy by employing a tactic similar to that of the Magyars. His cavalry pretended to flee, only to turn around and strike the disorganized enemy forces. The success of heavy cavalry lead to the development of a new kind of heavy cavalry, the