"For I am of the opinion... that the reconquest of the German speaking left bank of the Rhine is a matter of national honour, and that the Germanisation of a disloyal Holland and of Belgium is a political necessity for us. Shall we let the German nationality be completely suppressed in these countries, while the Slavs are rising ever more powerfully in the East?"
January 1, 1970
https://en.wikiquote.org/wiki/Friedrich_Engels