Kingdom of Scotland 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 in English defeat at Bannockburn in 1314. Scottish naval forces allowed invasions of the Isle of Man in 1313 and 1317 and Ireland in 1315. They were also crucial in the blockade of Berwick, which led to its fall in 1318. After the establishment of Scottish independence, Robert
Robert the Bruce campaign into Scotland. Though he captured the castles of Bothwell and Turnberry, he did little to damage the Scots' fighting ability, and in January 1302 he agreed to a nine-month truce. It was around this time that Robert the Bruce submitted to Edward, along with other nobles, even though he had been on the side of the Scots until then. There were rumours that John Balliol would return to regain the Scottish throne. Soules, who had probably been appointed by John, supported his return, as did most other nobles. But it was no more than a rumour and nothing came