In August 1944, with German forces retreating to the Gothic Line on the Italian mainland, Fielding was tasked to lead a three-strong SOE group into Austria'sEast Tyrol and Carinthia, to help and encourage sabotage on German communication lines. The group was parachuted behind enemy lines near Tramonti in North Eastern Italy on 12–13 August, hoping to gain support from Italian partisans. Although the communist Garibaldi partisans showed reluctance, the Osoppo partisans at Forni Avoltri, south of Austria, were willing to help and to hide them. He sent one of his group to reconnoitre within Carinthia but the report back showed that there was little willingness to take up resistance through fear of Gestapo reprisal. Despite lacking identity papers, Fielding decided to reconnoitre the upper Gail Valley and Carinthia personally and came to the same conclusion. The Germans had learned of the presence of Fielding, and other SOE groups, and offered a reward for his capture. To keep the support of the partisans, he promised supply of arms and provisions by air, a promise that was impossible to keep through lack of suitable dropping zones. This air support, with promised supply drops, was aborted at the last minute, leading Fielding in his frustration to send an angry message to the Bari-based Balkan Air Force asking them to show more of the "spirit of the Battle of Britain and less of the Bottle of Bari". The lack of success of the mission led to an order to evacuate from Italy and to be picked up in Slovenia, a march of. The group, which by then had been augmented by remnants from other SOE operations, was betrayed and ambushed but escaped to Slovenia with loss of mules and equipment and a wounded arm for Fielding. Valuable information had been gathered by Fielding's mission and 6,000 German troops had been diverted to capture him. For this, in 1945 he was awarded the DSO for courage, resourcefulness, and outstanding leadership.
Later life
After the war, Fielding took to farming in the west of Ireland for nine years. He returned to Château d'Oex, where he had lived as a boy with his mother, taking up painting and running a sporting travel agency. In 2005, he died there. He married Beatrice Georgina Pope in 1940 and was survived by their son, Martin George Rudolf captain, The Queen's Own Hussars, MRICS and their daughter, Sarah Georgina, who married Lt.-Col. Hon. Guy Bainbridge Norrie, the son of Lt.-Gen. Charles Willoughby Moke Norrie, 1st Baron Norrie, and Patricia Merryweather Bainbridge