An Age of Kings S01 E13 Henry VI, Part 5: The Sun in Splendour

The Duke of York was killed by Queen Margaret at Wakefield, but the Yorkists, under their dead leader's son Edward, smashed the Lancastrians in the snow at Towton. Queen Margaret and her son have fled to France. Henry VI is Edward's prisoner. (Covers 3 Henry VI Act 3 S3—conclusion)