Military history of Scotland for Robert I's success was his ability to call on naval forces from the Islands. As a result of the expulsion of the Flemings from England in 1303, he gained the support of a major naval power in the North Sea. The development of naval power allowed Robert to successfully defeat English attempts to capture him in the Highlands and Islands and to blockade major English controlled fortresses at Perth and Stirling, the last forcing Edward II to attempt the relief that resulted at English defeat at Bannockburn in 1314. Scottish naval forces allowed invasions of the Isle of Man
History of Scotland despite the fact that he owed no allegiance to England. Rivals John Comyn and Robert the Bruce, grandson of the claimant, were appointed as joint guardians in his place. On 10 February 1306, Bruce participated in the murder of Comyn, at Greyfriars Kirk in Dumfries. Less than seven weeks later, on 25 March, Bruce was crowned as King. However, Edward's forces overran the country after defeating Bruce's small army at the Battle of Methven. Despite the excommunication of Bruce and his followers by Pope Clement V, his support slowly strengthened; and by 1314 with the help of leading nobles such