The bravery medals of a German army officer who was executed for his role in the plot to assassinate Adolf Hitler are being put up for sale. Commander Ludwig von Leonrod was court-martialled and hanged in August 1944 following the unsuccessful attempt to blow up the evil Nazi dictator. The plot, codenamed Operation Valkyrie, involved members of the German military who were horrified by what their country had become under the Fuhrer. On July 20, 1944, one officer - Claus von Stauffenberg, played by Tom Cruise in the 2008 film Valkyrie - left a bomb under a table at a military conference Hitler was hosting at his Wolf's Lair base in Poland. Ludwig von Leonrod who was in Cavalry Regiment 17 alongside fellow Operation Valkyrie plotter Colonel Count Claus von Stauffenberg Claus von Stauffenberg (right) placed a bomb in a brief case under a table during a conference Adolf Hitler (left) was hosting at his Wolf's Lair base in Poland Although the brief case device went off and killed four people, Hitler survived as only one of the bombs was armed. After von Stauffenberg placed the brief case under the conference table it was moved behind a solid oak table leg, which shielded Hitler from the blast. Von Stauffenberg lost his left eye, his right hand, and two fingers on his left hand during tank fighting in north Africa, which made his attempts to arm the bombs harder. Von Leonrod was a liaison officer for the Nazi resistance unit but was not actively involved in the July 20 coup. But he had prior knowledge of the plot as his old friend, von Stauffenberg, had tried to get him to participate in the killing. On the day of the assassination attempt, von Ludwig was on a training course in Berlin and was arrested the next day. A silver breast eagle pin, with a four-part orders clasp with the Iron Cross 1939 and the Wehrmacht Long Service awards for 12 and 4 years and the West Wall medal awarded to Ludwig von Leonrod Von Leonrod's medals include the Iron Cross and decorations for long service and are now being sold as part of the estate and archives of his family But because the officer, who was a devout Catholic, had previously mentioned the plot in a confessional with a priest, he was found to have known about what von Stauffenberg was planning and so was executed. The priest who heard his confession was also executed for having knowledge of the scheme. Von Leonrod's military medals were given back to his relatives, a noble Bavarian family whose ancestors included Barons and Lord Chamberlains to Bavarian Kings. Von Leonrod's medals, that include the Iron Cross and decorations for long service, are now being sold by German auction house Hermann Historica as part of the estate and archives of the von Leonrod family. A spokesman for Hermann Historica of Munich said: 'Of rather tragic nature is the contribution of the last in the male line, Ludwig Freiherrn von Leonrod. Ludwig von Leonrod with his brother Maximilian in their younger days. He was executed aged 37 for his role in the plot to assassinate Hitler 'A large batch of photographs and documents detailing the life of a nobleman, executed by his Nazi henchmen in 1944 as a conspirator to the failed assassination attempt on Adolf Hitler in July of the same year. 'Hermann Historica is proud to offer the well documented but untouched family archives. The group includes a number of exceptionally rare awards that would assured grace any museum collection. Von Leonrod's officer's cross medal with the swords of the Order of the Crown of Romania 'Medals and decorations linked to the youngest member who gave his life after July 20th of 1944.' Born in Munich in 1906, von Leonrod was the elder son of Lord Chamberlain Wilhelm Freiherr von Leonrod and his wife Clara. From 1926 he served in the 17th Cavalry Regiment Bamberg. The cavalry was composed of noblemen who were wealthy and had their own riding school. Von Stauffenberg served in the regiment which is how he came to know von Leonrod. He rose to the rank of major and was awarded the Iron Cross as commander of an intelligence unit in 1941. A year later von Leonrod was severely wounded by a landmine and was subsequently transferred to take command of military district VII in Munich. He was approached by von Stauffenberg to become the resistance's liaison officer for the same district and was aged 37 when he was executed at Plotzensee Prison in Berlin. Both von Stauffenberg and his fellow conspirator, von Leonrod, served in the Cavalry Regiment 17. His medals are being sold for €1,000 on March 15. All rights reserved for this news site dailymail and under his responsibility