De Groof was then selected to write the background music and arrangement by Helmut Käutner for his legendary guerrilla and anti-war film Die letzte Brücke (The Last Bridge).
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After the blowing up of the last bridge over the river, he managed to swim the Elster, but Poniatowski drowned.
During September 1943 in the Raum sector the division was under attack by the Russian's, Röhder's Battery was able to withdraw to defend the last bridge over the River Worskla, so the rest of the Division could pull back over it before it had to be blown up.