Operation Hummingbird, commonly known as the Night of the Long Knives (German: die Nacht der langen Messer) was a purge lasting from the 30th June to the 2nd July of 1934. It is known as Röhm-Putsch in Germany.
At least 85 people were killed in the purge and over a thousand Nazi opponents were arrested. After the event, Ernst Röhm was visited in prison by Theodore Eick and Michel Lippert on the behalf of Adolf Hitler. They handed Röhm a Browning pistol and gave him 10 minutes to kill himself. After 10 minutes, they returned and having found him very much alive, Lippert shot him three times thus killing him.