During the evening of March 26, 1944, fifteen O.S.S. agents were executed following a failed raid on Italian soil to blow-up an Axis railroad tunnel. The sabotage mission was in support of the allied attack taking place further south at Monte Cassino (Battle of Monte Cassino, January 17, 1944 – May 19, 1944) and had the tunnel been successfully blown, supplies to the defending Germans would have been cut off.
This YANK MAGAZINE article reported on the first war crime trial of the post World War Two era: the trial of German General Anton Dostler (1891 - 1945), who gave the order to execute the O.S.S. prisoners. In his defense, General Dostler insisted that he was acting under the orders of General Gustav von Zangen, who denied the claim.