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In page Tewkesbury Medieval Festival:

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The festival's main feature is its re-enactment of the Battle of Tewkesbury, which was fought on 4 May 1471 between the Houses of York and Lancaster. The engagement was a decisive victory for the Yorkists and their leader, King Edward IV. The forces of the House of Lancaster were decimated, and their leaders killed or captured, leaving Edward as the unchallenged ruler of England. Several Lancastrians fled the battlefield and sought sanctuary at Tewkesbury Abbey. The Yorkists stormed the abbey, captured their foes, and executed them.[1]