Arumer Zwarte Hoop
Pier's armed band, known as the Arumer Zwarte Hoop (English: Black Gang from Arum), were pirates mainly active against the Hollanders and Burgundians at sea. He managed to capture many English and Dutch ships, mainly on the Zuider Zee (today's ‘IJsselmeer’). In the biggest battle of his career, in 1515, he captured 28 Dutch ships, which earned him the nickname "Cross of the Dutchmen". Erasmus criticized Grutte Pier's exploits.
Read more about this topic: Pier Gerlofs Donia, Peasant Rebels