In the Lower Danube region, these knives existed in the VIII-X centuries, thus disappearing from the Middle Danube region, but appear in abundance in almost all East European Plain . In the VI-VII centuries in the Middle and Lower Danube dominated by Slavs. They made up a significant part of the inhabitants of the Avar Khaganate. It was a force that contributed residence of nomads, bringing them to farming and craft activities. We have already mentioned about the Slavic-Avar symbiosis, where among other things the Slavs played the role of the sea and the people responsible for the actions of the Navy in joint military operations.