 Complete the following phrase:  In deciding what to do, a series of military conferences were scheduled at the Wolfs 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 