In 568, the Langobards receded into northern Italy. Subsequently, in the last decades of the 6th century, Slavs settled in the depopulated territory with the help of their Avar overlords. In 588 they reached the area of the Upper Sava River and in 591 they arrived in the Upper Drava region, where they soon fought the Bavarians under Duke Tassilo I. In 592 the Bavarians won, but three years later in 595 the Slavic-Avar army gained victory and thus consolidated the boundary between the Frankish and the Avar territories. By that time, today's East Tyrol and Carinthia came to be referred to in historical sources as "Provincia Sclaborum" (the Country of Slavs).