the men he had alienated the year before – including Henry of Almain and John de Warenne, 6th Earl of Surrey – and retook Windsor Castle from the rebels. Through the arbitration of King Louis IX of France an agreement was made between the two parties. This Mise of Amiens was largely favourable to the royalist side and would cause further conflict. Civil war and crusades, 1264–1273 Second Barons' War The years 1264–1267 saw the conflict known as the Second Barons' War, in which baronial forces led by the Earl of Leicester fought against those who remained loyal to the King. Edward initiated the armed conflict by capturing the rebel-held city of Gloucester. When Robert de Ferrers, 6th Earl of Derby, came to the assistance of the baronial forces, Edward negotiated a truce with the Earl. Edward later broke the terms of the agreement. He then captured Northampton from Simon de Montfort the Younger before embarking on a retaliatory campaign against Derby's lands. The baronial and royalist forces met at the Battle of Lewes, on 14 May 1264. Edward, commanding the right wing, performed well, and soon defeated the London contingent of the Earl of Leicester's forces. Unwisely, he pursued the scattered enemy, and on his return found the rest of the royal army defeated. By the Mise of Lewes, Edward and his cousin Henry of Almain were given up as hostages to Leicester. Edward remained in captivity until March 1265, and even after his release he was kept under strict surveillance. In Hereford, he escaped on 28 May while out riding and joined up with Gilbert de Clare, 7th Earl of Gloucester, who had recently defected to the King's side. The Earl of Leicester's support was now dwindling, and Edward retook Worcester and Gloucester with little effort. Meanwhile, Leicester had made an alliance with Llywelyn and started moving east to join forces with his son Simon. Edward made a surprise attack at Kenilworth Castle, where the younger Montfort was quartered, before moving on to cut off the Earl of Leicester. The two forces then met at the Battle of Evesham, on 4 August 1265. The Earl of Leicester stood little chance against the superior royal forces, and after his defeat he was killed and mutilated on the field. Through such episodes as the deception of Derby at Gloucester, Edward acquired a reputation as untrustworthy. During the summer campaign he