Though historians have generally shown understanding for Harclay's actions, it is nevertheless common to refer to the event as "Harclay's treason". In the words of Maurice Keen: "To make a truce, or to indeed to give safe-conducts or make any agreement with the king's enemies without proper grant of powers, again constituted lèse majesté and can be found defined as such in other military cases". Harclay had received such powers in February 1322, but he was considered to have overstepped his prerogative by the 1323 treaty. It is also possible that Edward held a grudge against Harclay for the latter's failure to come to the rescue at Byland, and that this was behind the king's later, severe reaction. There is, however, no evidence that Harclay received the royal letter in time to arrive at the battlefield any earlier than he did.