The loser of this battle renewed his invasion the next year, only to be
 stopped by a meeting with Pope Leo I.
This battle began immediately after the destruction of the losing side's rear guard, which had been
 charged with defending a retreat from Orleans. One leader in this battle, Sangiban, was intentionally placed
 in the center of one side's line to prevent his defection. Thorismund became king of the Visigoths after the
 death of Theodoric during this battle, which also saw the Gepids under Ardaric fail to hold against the
 Roman Army under Flavius Aetius. The loser of this battle renewed his invasion the next year, only to be
 stopped by a meeting with Pope Leo I. For 10 points, name this 451 battle that fought back Atilla the Hun's
 invasion of Western Europe.
This battle began immediately after the destruction of the losing side's rear guard, which had been
 charged with defending a retreat from Orleans.
Battle of {Chalons} [or Battle of {Catalaunian Plains}]