by new fortifications on Inchgarvie. Scottish ships had some success against privateers, accompanied the king in his expeditions in the islands and intervened in conflicts in Scandinavia and the Baltic Sea. Expeditions to the Highlands to Islands to curb the power of the MacDonald Lord of the Isles were largely ineffective until in 1504 the king accompanied a squadron under Wood heavily armed with artillery, which battered the MacDonald strongholds into submission. Since some of these island fortresses could only be attacked from seaward, naval historian N. A. M. Rodger has suggested this may have marked the end of medieval naval warfare in the British Isles, ushering in a new tradition of artillery warfare. The king acquired a total of 38 ships for the Royal Scottish Navy, including Margaret, and the carrack Michael or Great Michael, the largest warship of its time (1511). The latter, built at great expense at Newhaven and launched in 1511, was in length, weighed 1,000 tons, had 24 cannon, and was, at that time, the largest ship in Europe. It marked a shift in designed as it was designed specifically to carry a main armament of heavy artillery. In the Flodden campaign the fleet consisted of 16 large and 10 smaller craft. After a raid on Carrickfergus in Ireland, it joined up with the French and had little impact on the war. After the disaster at Flodden the Great Michael, and perhaps other ships, were sold to the French and the king's ships disappeared from royal records after 1516. Scottish naval efforts would again rely on privateering captains and hired merchantmen during the minority of James V. In the Habsburg-Valois war of 1521–26, in which England and Scotland became involved on respective sides, the Scots had six men-of-war active attacking English and Imperial shipping and they blockaded the Humber in 1523. Although prizes were taken by Robert Barton and other captains, the naval campaign was sporadic and indecisive. Privateers Scots privateers and pirates preyed upon shipping in the North Sea and off the Atlantic coast of France. Scotland's Admiralty court judged whether a captured ship was a lawful prize and dealt with the recovery of goods. As the court was entitled to a tenth of the value of a prize, it was a profitable business for the admiral. The privateers Andrew and Robert Barton were still using their letters of reprisal of 1506 against the