Warwick restored Henry VI to the throne in October 1470, however Edward IV returned to the country in March 1471 and quickly captured London and the person of Henry VI. The mentally troubled Henry VI was taken by Edward IV as a prisoner to the Battle of Barnet, where Warwick was killed on 14 April 1471. Edward IV then incarcerated Henry VI in the Tower of London. Following the decisive Yorkist victory at the Battle of Tewkesbury on 4 May, Henry was reported to have died of "pure displeasure and melancholy," although "The Great Chronicle of London" reported that Richard, Duke of Gloucester, was responsible for his death. As Constable of England, he probably delivered King Edward's order to kill Henry to the Constable of the Tower.