He joined the
Wehrmacht in the autumn of 1938, belonged to the Potsdam
Infantry Regiment 9 and fought and was wounded at the
Battle of Stalingrad. In July 1943 Klausing was wounded again during the Battle of Wolchow (Volkhov) near Lake Ladoga (Leningrad). He was subsequently posted to be an office assistant at the
Oberkommando der Wehrmacht and was drawn into the plan to
assassinate Hitler by
Fritz-Dietlof von der Schulenburg. On 11 July 1944, on the first attempt on Hitler's life, Klausing went along with
Claus Schenk von Stauffenberg as his adjutant to the Obersalzberg (
i.e. the
Berghof near
Berchtesgaden) and made sure that a car and a plane were standing by, ready to whisk the plotters away to Berlin after the job had been done. The Obersalzberg plan was, however, put off, as was a second attempt on 15 July at the
Wolf's Lair near
Rastenburg in
East Prussia, where Klausing made the same preparations for Stauffenberg. On 20 July, Captain Klausing stayed behind at the
Bendlerblock in Berlin while Stauffenberg went to the Wolf's Lair to try again, and was jointly responsible for forwarding
Operation Valkyrie orders. He forwarded the orders to, among others,
Ewald-Heinrich von Kleist-Schmenzin. On the night of 20–21 July, after it had become apparent that Stauffenberg's briefcase bomb had not killed Hitler, Klausing was the only one to escape the firefight at the Bendlerblock subsequent to which Stauffenberg and several other conspirators were captured, but the next morning, he gave himself up to the
Gestapo. ==Death==