Not only the English corsairs participated to this collaboration, but also the Dutch, who shared the same objectives. Catholic ships were attacked and the crew and passengers taken to Algiers, modern day Algeria, or other places of the Barbary Coast to be sold as slaves. The number of these English pirates was significant. Jack Ward, Henry Mainwaring, Robert Walsingham and Peter Easton were among such English pirates in the service of the deys of the Barbary coast. Some of the most famous Dutch pirates were Zymen Danseker, Salomo de Veenboer and Jan Janszoon. Some of them, such as Ward and Danseker, were renegades who had adopted Islam. Mainwaring attacked the Spanish preferentially, and claimed that he avoided English shipping, but generally ships of all nationalities seem to have been attacked. Walsingham is known to have freed Turkish captives from Christian galleys, and to have sold Christian captives on the North African slave market. Janszoon led long-ranging raids such as the Turkish Abductions in Iceland to sell his slaves on the Barbary Coast.