York led his supporters, Nevilles, Earl of Salisbury and Warwick into rebellion against Henry VI. Their aim the elimination of Margarets control, the removal of Somerset and control of the King. York wanted to carve out a new career as king's cheif councillor. Somerset and Margaret convinced Henry York was committing treason.
Henry VI summoned York to Leicester to explain himself. York surprised the king by attending the meeting backed by a force of over 3000 men. The king had fewer than 2000 men so he was forced to negotiate; the failure of there talks led to the so called battle. Although the battle was little more than a skirmish as only 60/70 men died. Henry VI was wounded by an arrow and among the dead lay Somerset and Henry Percy, Earl of Northumberland