This study by the U.S. War Department concerned the tactical uses of German airborne forces throughout the course of the war; from the Battle of Crete to the Battle of the Bulge:
"In Russia, the Balkans, and the December 1944 counteroffensive in the Ardennes, units varying in strength from a platoon to a battalion have been landed behind enemy lines to disrupt communications, to seize such key points as railroads, roadheads, bridges and power stations."
Click here to read about the German concept of Blitzkrieg.
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