Bedford. These were substantial estates, providing an income of at least £600 per annum. Montagu was to be the new regional magnate – as he had been in the north – to fill an existing power vacuum. Rebellion and death Montagu, though, was not happy with the new arrangements, and King Edward has been held responsible for turning Montagu from a friend to an enemy. Warkworth's Chronicle describes him as condemning these grants to him as "a [mag]pyes] nest." Montagu had been on the Scottish border since at least January 1470. Following unrest in Lincolnshire and the subsequent Lincolnshire rebellion, the king marched from London to crush the rising. This he did at the Battle of Empingham. Following the battle, Edward headed north where he was met by Montagu and Northumberland at Doncaster. Warwick and Clarence's involvement in the Lincolnshire uprising had by now been established, and they fled to Calais. Further trouble broke out in the summer of 1470 in the north, with friends and relatives of Warwick in open rebellion. The new Earl of Northumberland was unable to put down these risings, so the king, once again marched north to deal with it personally. Modern historians generally consider that these rebellions were a deliberate trap, instigated by Warwick and Clarence from Calais. On 24 June 1470 the Wardenship of the East March was stripped from Montagu and given to Percy. Edward was still in the north with Percy when he received word that Warwick and Clarence had landed in Dartmouth. At Doncaster, the king awaited Montagu, who was in the north raising a substantial force in Edward's name. Edward waited; but on 29 September 1470, marching to the King, Montagu declared for Warwick. His last-minute, surprise defection from the king has been called "decisive". The king was trapped; disbanding his army, and with a few followers, he escaped to Bishop's Lynn, sailing for Burgundy on 2 October. Readeption of Henry VI On 3 October, with Edward IV in exile, Henry VI was released from the Tower and returned to the throne by Warwick. Almost immediately, Montagu was granted the wardship of the executed Earl of Worcester's heir and estates, as well as of the young Lord Clifford. He was reappointed to the Wardenship of the East March, with its salary, on 22 October 1470. However, Montagu did not profit from the new regime as he probably expected to.