In 1258 the Provisions of Oxford established a baronial government of which Hugh's elder brother Roger Bigod, 4th Earl of Norfolk was a leading member, and Hugh was appointed Chief Justiciar. He also had wardship of the Tower of London, and, briefly, of Dover Castle. But at the end of 1260 or in early 1261 he resigned these offices, apparently due to dissatisfaction with the new government. Thus in 1263 he joined the royalists, and was present on that side at the Battle of Lewes. That battle took place by a village called Fletching, north of Lewes. Hugh escaped but the King and his son, Prince Edward, were taken prisoner.