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By the transplantation of Slav peoples to the western borders of his
robber-State the Khagan meant to keep in check his neighbours, the
Saxons on the lower Elbe, the Franks on the Saale, the Bavarians on
the Nab and upper Danube, the Lombards in Italy, while he himself,
with his rear protected, was free for           raids on the East Roman
Empire, in which he employed enormous masses of Slavs as befitlci.