The air attack on the fortress of Koepenick[1] is the sarcastic moniker of an incident in the air war over Germany during World War II. It took place in October 1943 and was an example of target confusion.[2] The US 8th Air Force sent 119 bombers to attack the western town of Düren, but the German air force, Luftwaffe, incorrectly chased a phantom target all the way to Plzeň. When the target failed to materialize, the commander of German defenders, Hermann Göring, sent a sarcastic telegram to all concerned, congratulating them and himself on "the successful defence of the fortress of Koepenick", a reference to the 20th century hoax, Captain of Köpenick.[1][2]