Despite a near constant blockade of the Dunkirkers' ports by Dutch warships, the privateers routinely managed to evade the blockaders and inflict much damage to Dutch shipping. Though the Dutch at times prevented the Dunkirkers from reaching open sea, during the winter months the blockade was extremely difficult to maintain and permitted virtually free passage. Sometimes naval battles ensued when privateers tried to break out or when Dutch warships tried to destroy the privateers in their harbours. During one of these Dutch attacks, the Dutch folk hero
Piet Pieterszoon Hein, famous for capturing a
Spanish treasure fleet, was killed. The Dutch declared the Dunkirk privateers
pirates in 1587; captains of Dutch naval vessels had to swear an oath that they would throw or beat all prisoners from Dunkirk warships into the sea (euphemistically known as
voetenspoelen, "washing the feet"). Due to its excessive harshness and the fact that it provoked equally cruel retributions from the side of the privateers, this standing order was very unpopular with Dutch crews and the general public. The order was often evaded by putting Dunkirk seamen off on one of the many shallow shoals off the Flemish coast from which they could wade to dry land. The Dunkirkers had an extremely wide range for their era. Although mainly operating in and around the Channel, they also sailed near the
Danish and
German coastal areas to intercept Dutch ships returning from the
Baltic, and operated in
Spanish and
Mediterranean waters. Renowned commanders like
Michel Jacobsen also had taken part in actions against the
Ottoman Empire. They cooperated closely with the Spanish navy, for instance, in the
Battle of the Downs. This combined effort reached a peak of effectiveness during the time the Eighty Years' War merged with the
Thirty Years' War. To evade the Dutch navy the Dunkirk admiralty had a special type of small and very maneuverable warship constructed, the
frigate. Frigate-like ship types were soon adopted by other navies and still have their modern-day counterparts. boards a Dutch vessel at the
Battle of Texel In 1600 the Dutch sent an army to conquer the city of Dunkirk and stop the privateering once and for all. The Dutch invasion force clashed with a
Spanish army and although the Dutch won the resulting
Battle of Nieuwpoort the Dutch commander,
stadtholder Maurits of Nassau, realised his lines were dangerously over-stretched and so turned back to the Republic. The Flemish Fleet continued to be especially damaging to the
herring fisheries of
Holland and
Zeeland, almost completely wiping out the sector on several occasions. However, Dutch merchantmen proved far more valuable targets, sometimes vessels on their way back from
Russia or as far as the
Indies were captured, along with their valuable cargoes. After 1621, when the
Twelve Years' Truce ended, the Dunkirkers captured on average 229 merchantmen and fishing vessels per year from the Dutch. By 1628, they had also seized 522
English vessels, primarily
fishing boats but also ships carrying munitions and victuals to the Dutch. This was one of the major concerns of
Charles I's diplomatic representative in
Brussels, Sir
Balthazar Gerbier, who eventually managed to have tobacco taken off the list of 'victuals'. One of the most successful raiders of this period was
Jacob Collaert. It was not until October 1646, when the French captured Dunkirk with Dutch naval support, that the danger from the privateers was greatly reduced. In 1652, Spanish forces recaptured the city and the Dunkirkers once again became a major threat. The Dunkirkers preyed on English trade after England resumed hostilities against Spain in 1657, before Dunkirk was captured by a Franco-English force in 1658. However, they continued to operate and Ostend became their most important port. When, after 1672, France and the
Dutch Republic became enemies, privateering activities were resumed at Dunkirk, this time for France, and this would last intermittently until 1712. A famous Dunkirk privateer from this period was
Jean Bart. ==See also==