Armando Diaz, 1st Duke of the Victory, (5 December 1861 – 28 February 1928) was an Italian general and a Marshal of Italy. He is mostly known for his role as Chief of Staff of the Regio Esercito during World War I from November 1917. He managed to stop the Austro-Hungarian advance along the Piave River in the First Battle of Monte Grappa. In June 1918, he led the Italian forces to a major victory at the Second Battle of the Piave River. A few months later, he achieved a decisive victory in the Battle of Vittorio Veneto, which ended the war on the Italian Front. He is celebrated as one of the greatest generals of the war.