Warfare in Medieval Scotland and supply his armies. Part of the reason 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
Robert the Bruce the River Tay. The following year, the clergy of Scotland recognised Bruce as king at a general council. The support given him by the church, in spite of his excommunication, was of great political importance. On 1 October 1310 Bruce wrote Edward II of England from Kildrum in Cumbernauld Parish in an unsuccessful attempt to establish peace between Scotland and England. Over the next three years, one English-held castle or outpost after another was captured and reduced: Linlithgow in 1310, Dumbarton in 1311, and Perth, by Bruce himself, in January 1312. Bruce also made raids into northern England and, landing