On April 4, 1945, American soldiers of the 4th Armored Division of General Patton’s US Third Army were moving through the city of Gotha in Germany, searching for a secret Nazi communications center when they unexpectedly came across the abandoned Ohrdruf forced labor camp, which was a sub-camp of the Buchenwald concentration camp. Ohrdruf was the first Nazi prison camp that still had a few survivors there when the Americans arrived.
In September 1944, US troops had witnessed the abandoned Natzweiler camp in Alsace, which was then a part of the Greater German Reich, but is now in France. But it was Ohrdruf where American soldiers first saw evidence of the atrocities committed in the Nazi camps.

