Night of the Long Knives - Wikipedia

"On June 28, 1934, Hitler flies to Essen to Essen to attend a wedding celebration and reception; from there he called Röhm's adjutant at Bad Wiessee and ordered SA leaders to meet with him on June 30 at 11h." Thus began the Night Night of the Long Knives. From the article:
"In response to conservative pressure to constrain Röhm, Hitler left for Neudeck to meet with Hindenburg. Blomberg, who had been meeting with the President, uncharacteristically reproached Hitler for not having moved against Röhm earlier. He then told Hitler that Hindenburg was close to declaring martial law and turning the government over to the Reichswehr if Hitler did not take immediate steps against Röhm and his brownshirts.[29] Hitler had hesitated for months in moving against Röhm, in part due to Röhm's visibility as the leader of a national militia with millions of members. However, the threat of a declaration of martial law from Hindenburg, the only person in Germany with the authority to potentially depose the Nazi regime, put Hitler under pressure to act. He left Neudeck with the intention of both destroying Röhm and settling scores with old enemies. Both Himmler and Göring welcomed Hitler's decision, since both had much to gain by Röhm's downfall – the independence of the SS for Himmler, and the removal of a rival for the future command of the army for Göring.[30]

In preparation for the purge, both Himmler and Reinhard Heydrich, chief of the SS Security Service, assembled a dossier of manufactured evidence to suggest that Röhm had been paid 12 million Reichsmark (EUR 48.2 million in 2018) by France to overthrow Hitler. Leading officers in the SS were shown falsified evidence on June 24 that Röhm planned to use the SA to launch a plot against the government (Röhm-Putsch).[31] At Hitler's direction, Göring, Himmler, Heydrich, and Victor Lutze drew up lists of people in and outside the SA to be killed. One of the men Göring recruited to assist him was Willi Lehmann, a Gestapo official and NKVD spy. On June 25, General Werner von Fritsch placed the Reichswehr on the highest level of alert.[32] On June 27, Hitler moved to secure the army's cooperation.[33] Blomberg and General Walther von Reichenau, the army's liaison to the party, gave it to him by expelling Röhm from the German Officers' League.[34] On June 28 Hitler went to Essen to attend a wedding celebration and reception; from there he called Röhm's adjutant at Bad Wiessee and ordered SA leaders to meet with him on June 30 at 11h.[30] On June 29, a signed article in Völkischer Beobachter by Blomberg appeared in which Blomberg stated with great fervour that the Reichswehr stood behind Hitler."