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 I turned his attention to building up a Scottish naval capacity. This was largely focused on the west coast, with the Exchequer Rolls of 1326 recording the feudal duties of his vassals in that region to aid him with their vessels and crews. Towards the end of his reign he supervised the building of at least one royal man-of-war near his palace at Cardross on the River Clyde. In the late fourteenth century naval warfare with England was conducted largely by hired Scots, Flemish and French merchantmen and privateers. James I took a greater interest in naval power. After his return to Scotland in 1424, he established a shipbuilding yard at Leith, a house for marine stores, and a workshop. King's ships were built and equipped there to be used for trade as well as war, one of which accompanied him on his expedition to the Islands in 1429. The office of Lord High Admiral was probably founded in this period. In his struggles with his nobles in 1488 James III received assistance from his two warships the Flower and the King's Carvel also known as the Yellow Carvel. There were various attempts to create royal naval forces in the fifteenth century. James IV put the enterprise on a new footing, founding a harbour at Newhaven and a dockyard at the Pools of Airth. He acquired a total of 38 ships including the Great Michael, at that time, the largest ship in Europe. Scottish ships had some success against privateers, accompanied the king on his expeditions in the islands and intervened in conflicts Scandinavia and the Baltic, but were sold after the Flodden campaign and after 1516 and Scottish naval efforts would rely on privateering captains and hired merchantmen. James V did not share his father's interest in developing a navy and shipbuilding fell behind the Low Countries. Despite truces between England and Scotland there were periodic outbreaks of a guerre de course. James V built a new harbour at Burntisland in 1542. The chief use of naval power in his reign was a series of expeditions to the Isles and France. After the Union of Crowns in 1603 conflict between Scotland and England ended,