Much of the information we have about the Battle of Glen Trool comes from the rhyming account of John Barbour. Barbour is an important source; but it should also be remembered that "The Brus" is written from a pro-Scottish perspective. The battle only receives a passing mention in the English records of the time in reference to some horses lost "in the pursuit of Robert de Brus between Glentruyl and Glenheur, on the army's last day in Galloway." That lack of mention might be because they preferred to ignore a loss or because they really considered it unimportant.