Warfare between the Order and the Lithuanians was especially brutal. It was common practice for Lithuanians to torture captured enemies and civilians, it is recorded by a Teutonic chronicler that they had the habit of tying captured Knights to their horses and having both of them burned alive, while sometimes a stake would be driven into their bodies or the Knight would be flayed. Lithuanian pagan customs included ritualistic human sacrifice, the hanging of widows, and the burying of a warrior's horses and servants with him after his death. The Knights would also, on occasion, take captives from defeated Lithuanians, whose condition (as that of other war captives in the Middle Ages) was extensively researched by Jacques Heers. The conflict had much influence in the political situation of the region, and was the source of many rivalries between Lithuanians or Poles and Germans, the degree to which it impacted the mentalities of the time can be seen in the lyrical works of men such as the contemporary Austrian poet Peter Suchenwirt.