Life in the Baltic lands in the middle ages was full of dangers. In the 13th century, the old rivalries between the local tribes were accompanied by fights against the Knights of the Cross, and the Knights of the Sword. By comparing the art of warfare practised by local tribes and alien Germans, one can notice considerable differences in technical issues, such as weaponry, fortifications, and strategies, as well as in warfare customs. In this respect, the Livonian Chronicle by Henry of Latvia is particularly telling. While Germans and other western Christians would adhere to the knightly rules of war in Livonia, local Baltic and Finno-Ugric peoples acted very much like the barbarians did during the times of the Great Migration of the Nations.