For10 points, name this decisive 1461 battle during the Wars of the Roses that allowed Edward IV to depose Henry VI.
In a ceremony following this battle, Sir Thomas Dymoke threw down his gauntlet to challenge any disputers of the king's claim to the throne. Because of its date, this engagement is sometimes called the Battle of Palm Sunday Field. This battle was preceded by a skirmish at the Aire River, where Lord Fitzwalter was killed by Lord Clifford's archers after rushing out of his tent without armor, thinking his men were quarreling. This followup to the Battle of Ferrybridge occurred along the Cock Beck, a tributary of the Wharfe River. William Hastings was knighted on the field of this battle, where Lord (*) Fauconberg took advantage of a strong wind to trick the enemy side into wasting its arrows. The late arrival of the Duke of Norfolk helped decide this battle, which forced Margaret of Anjou to flee England and is sometimes considered the bloodiest ever fought on English soil. For10 points, name this decisive 1461 battle during the Wars of the Roses that allowed Edward IV to depose Henry VI. 
In a ceremony following this battle, Sir Thomas Dymoke threw down his gauntlet to challenge any disputers of the king's claim to the throne.
Battle of  Towton [accept Battle of Palm Sunday Field early]