The Scots Brigade, which had existed since 1572, was another outlet for Scottish soldiers looking for service in Continental armies. Although in the service and under the payroll of the States-General of the Dutch Republic, these troops were, first and foremost, loyal to the House of Stuart. Nonetheless, Scottish soldiers may have chosen to serve in the Republic due to their religious beliefs, perhaps as part of movement of "Calvinist Internationalism." Notable officers include Colonel William Brog, William Balfour, James Livingston, 1st Earl of Callendar, and several generations of the Lords and Earls of Buccleuch. Notable engagements during their service in the Eighty Years' War include the Battle of Nieuwpoort (1600), the Siege of Ostend (1601-1604), the War of the Jülich Succession (1609-1610), the Siege of Bergen-op-Zoom (1622), the Siege of 's-Hertogenbosch (1629), and the Siege of Breda (1637), among countless others.