In deciding what to do, a series of military conferences were scheduled at the Wolf's Lair headquarters in East Prussia. On 20 July, Adolf Hitler and his top military commanders entered the briefing hut of the headquarters, as the usual bombproof room, with no windows and thick walls of solid concrete, was considered "unbearably hot". In attendance was Colonel Claus von Stauffenberg, who had been severely wounded in 1943 in Tunisia, losing his left eye, right hand and half of his left hand. Undetected by Hitler's ring of bodyguards, Stauffenberg carried a British-made bomb in his briefcase. His plan was to get as close as possible to Hitler, leave the briefcase nearby, and then make an excuse to quickly leave the conference by car with his adjutant and fellow conspirator Werner von Haeften. This was part of a larger planned coup d'état led by a group of army officers who were appalled by the way Hitler was leading Germany in World War II. Everything proceeded according to plan until the bomb exploded, as Stauffenberg walked towards his car, earlier than anticipated. When the explosion tore through the hut, Stauffenberg was thoroughly convinced that no one in the room could possibly have survived. Unbeknownst to Stauffenberg, Colonel Heinz Brandt had moved the briefcase containing the bomb further away from Hitler, placing it behind a solid wooden table leg, as it was in his way. Hitler survived with only minor injuries, as did most of the others present. A stenographer was killed instantly. Three officers, including Brandt, died of their injuries.