The FHO collection of both military and political intelligence from captured Red Army soldiers assured Gehlen's post–WWII survival as a Western anticommunist spymaster, with networks of spies and secret agents in the countries of Soviet-occupied Europe. During the German war against the Soviet Union in 1941to 1945, Gehlen's FHO collected much tactical military intelligence about the Red Army, and much strategic political intelligence about the Soviet Union. Understanding that the Soviet Union would defeat and occupy the Third Reich, Gehlen ordered the FHO intelligence files copied to microfilm; the FHO files proper were stored in watertight drums and buried in various locations in the Austrian Alps.