Barbary pirates - July 1625 and the 1700s.
Main Article - Barbary Pirates or Corsairs
The height of North African Arab Muslim pirates' violence against Christians, mainly British, Barbary pirates called Britain's 200-year jihad. There are tales of unspeakable barbarism including the Sultan, Moulay Ismail, who tortured and butchered the captives at whim. It involved also forced conversion of the British Christians into Islam. The "Sally Rovers" were called 'al-ghuzat'-- the term once used for the soldiers who fought with Muhammad—and were hailed as religious warriors engaged in a holy war against the infidel Christians who were pressurised to convert to Islam under threat of hideous punishment, writes historian Giles Milton.
In negotiating a peace treaty and protect the United States from the threat of Barbary piracy, the future United States presidents Thomas Jefferson, John Adams questioned the Tripolitan ambassador to Britain Sidi Haji Abdul Rahman Adja as to "why his government was so hostile to the new American republic even though America had done nothing to provoke any such animosity." Ambassador Adja answered them, as they reported to the Continental Congress,
"that it was founded on the Laws of their Prophet, that it was written in their Koran, that all nations who should not have acknowledged their authority were sinners, that it was their right and duty to make war upon them wherever they could be found, and to make slaves of all they could take as Prisoners, and that every Musselman who should be slain in Battle was sure to go to Paradise."