There were various attempts to create royal naval forces in the 15th 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 in Scandinavia and the Baltic, but were sold after the Flodden campaign and after 1516 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 that of 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, but Scotland found itself involved in England's foreign policy, opening up Scottish shipping to attack. In 1626, a squadron of three ships was bought and equipped. There were also several marque fleets of privateers. In 1627, the Royal Scots Navy and accompanying contingents of burgh privateers participated in the major expedition to Biscay. The Scots also returned to the West Indies and in 1629 took part in the capture of Quebec.