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
Battle of Dalrigh Macdonalds of Islay and the Campbells of Loch Awe, whom he defeated in battle sometime in the mid-1290s. The outbreak of the War of Independence in 1296 placed the MacDougalls on the side of the Scottish patriots. This changed in the most dramatic fashion in February 1306, when Robert Bruce killed John Comyn. Soon after Bruce seized the crown, and the Macdougalls and other families with Balliol and Comyn associations became allies of the English. In June 1306, Robert Bruce and his army were caught unprepared at the Battle of Methven, west of Perth, by Aymer de Valence, an English