List of members of the 20 July plot
On 20 July 1944, Adolf Hitler and his top military associates entered the briefing hut of the Wolf's Lair military headquarters, a series of concrete bunkers and shelters located deep in the forest of East Prussia, not far from the location of the World War I Battle of Tannenberg. Soon after, an explosion killed three officers and a stenographer, injuring everyone else in the room.
Source: Wikipedia — List of members of the 20 July plot (CC BY-SA 4.0)