The position towards France of Edward I. made it really more desirable for him that Scotland should be independent and friendly, than half subdued and hostile to his rule.  While she was hostile, England, in attacking France, always left an enemy in her rear.  But Edward supposed that by clemency to all the Scottish leaders except Wallace, by giving them great appointments and trusting them fully, and by calling them to his Parliament in London, he could combine England and Scotland in affectionate union.  He repaired the ruins of war in Scotland; he began to study her laws and customs; he hastily ran up for her a new constitution, and appointed his nephew, John of Brittany, as governor.  But he had overlooked two facts:  the Scottish clergy, from the highest to the lowest, were irreconcilably opposed to union with England; and the greatest and most warlike of the Scottish nobles, if not patriotic, were fickle and insatiably ambitious.  It is hard to reckon how often Robert Bruce had turned his coat, and how often the Bishop of St Andrews had taken the oath to Edward.  Both men were in Edward’s favour in June 1304, but in that month they made against him a treasonable secret covenant.  Through 1305 Bruce prospered in Edward’s service, on February 10, 1306, Edward was conferring on him a new favour, little guessing that Bruce, after some negotiation with his old rival, the Red Comyn, had slain him (an uncle of his was also butchered) before the high altar of the Church of the Franciscans in Dumfries.  Apparently Bruce had tried to enlist Comyn in his conspiracy, and had found him recalcitrant, or feared that he would be treacherous (February 10, 1306).

The sacrilegious homicide made it impossible for Bruce again to waver.  He could not hope for pardon; he must be victorious or share the fate of Wallace.  He summoned his adherents, including young James Douglas, received the support of the Bishops of St Andrews and Glasgow, hurried to Scone, and there was hastily crowned with a slight coronet, in the presence of but two earls and three bishops.

Edward made vast warlike preparations and forswore leniency, while Bruce, under papal excommunication, which he slighted, collected a few nobles, such as Lennox, Atholl, Errol, and a brother of the chief of the Frazers.  Other chiefs, kinsmen of the slain Comyn, among them Macdowal of Argyll, banded to avenge the victim; Bruce’s little force was defeated at Methven Wood, near Perth, by Aymer de Valence, and prisoners of all ranks were hanged as traitors, while two bishops were placed in irons.  Bruce took to the heather, pursued by the Macdowals no less than by the English; his queen was captured, his brother Nigel was executed; he cut his way to the wild west coast, aided only by Sir Nial Campbell of Loch Awe, who thus founded the fortune of his house, and by the Macdonalds, under Angus Og of Islay.  He wintered in the isle of Rathlin (some think he even went to Norway), and in spring, after surprising the English garrison in his own castle of Turnberry, he roamed, now lonely, now with a mobile little force, in Galloway, always evading and sometimes defeating his English pursuers.  At Loch Trool and at London Hill (Drumclog) he dealt them heavy blows, while on June 7, 1307, his great enemy Edward died at Borough-on-Sands, leaving the crown and the war to the weakling Edward II.