A. Bonfinius, an Italian humanist, in his work Rerum Ungaricarum decades describes the reign of Matthias Corvinus 1458-1459 in considerable detail, covering the period from his coronation until his death. Narrating the facts, Bonfinius also gives us important insight on Matthia's war against the Bohemian king George of Podebrady 1458-1471. He elaborates on Matthia's reasons to start the war and then describes all relevant military operations until George's death, i.e. until a new king was elected. While insisting on justifying Matthia's invasion of Bohemia merely by faith matters - which was not completely true, Bonfinius still provides us with an objective description of military operations. A long-lasting and rather futile war campaign was soon to provoke a rebellion against the king, headed by the chief dignitaries.