The serfs and common people considered him a just ruler because he protected them from excessive demands and other abuses by the magnates. Under his rule, in 1479, the Hungarian army destroyed the Ottoman and Wallachian troops at the Battle of Breadfield. Abroad he defeated the Polish and German imperial armies of Frederick at Breslau (Wrocław). Matthias' mercenary standing army, the Black Army of Hungary, was an unusually large army for its time, and it conquered parts of Austria, Vienna (1485), and parts of Bohemia.