The losses inflicted on the Jews of Poland during the fatal decade 1648–1658 were appalling. In the reports of the chroniclers, the number of Jewish victims varies between one hundred thousand and five hundred thousand. But even if we accept the lower figure, the number of victims still remains colossal, even exceeding the catastrophes of the Crusades and the Black Death in Western Europe. Some seven hundred Jewish communities in Poland had suffered massacre and pillage. In the Ukrainian cities situated on the left banks of the Dnieper, the region populated by Cossacks ... the Jewish communities had disappeared almost completely. In the localities on the right shore of the Dneiper or in the Polish part of Ukraine as well as those of Volhynia and Podolia, wherever Cossacks had made their appearance, only about one tenth of the Jewish population survived.