These were especially brutal during the First Crusade, when the Jewish communities in Cologne, Mainz, and Worms were destroyed, as well as other communities in cities between the rivers Seine and the Rhine.
Disse var især brutale under det første korstog, hvor jødiske samfund i Köln, Mainz og Worms blev ødelagt, og andre samfund i byer mellem floderne Seinen og Rhinen oplevede også ødelæggelser.