One of the realities of international relations is that even the most bellicose of nations need justification, however flimsy, to initiate war. When Germany invaded Poland on September 1st, 1939, the stated pretext was a series of Polish attacks on German military installations. The most significant of these attacks was the Gleiwitz incident, which saw German soldiers stage an attack on a radio station on August 31st, 1939.
Operation Himmler was a series of SS false flag attacks carried out in August. These attacks were supposed to create the impression of Polish aggression against Germany. News of these attacks was fed to the German press who would then report to the people that Germany was under attack. Operation Gleiwitz was the culmination of this operation. A small group of agents dressed in Polish uniforms and attacked a German radio station near the border. They broadcast an anti-German message and then left. To make the attack more credible a Silesian, Catholic, and pro-Polish farmer named Franciszek Honoik was murdered and made to look like a saboteur. His body was then left near the station. Further, several inmates from the Dachau concentration camp were murdered, disfigured, and left near the station. No international journalists were allowed to examine the station, and the attack was soon forgotten once the war began the following day.
Adolf Hitler never intended for Operation Gleiwitz to convince the international community of anything. He only needed an immediate excuse. If Germany had won the war, no one would have cared to determine if Operation Gleiwitz were a real attack or a false flag. Germany would have written the history books, and future generations would have simply accepted the attack as real. He who controls the present controls the past. When one entity controls the flow of information, that entity determines the truth.