Lower Hesse
Bernard was involved in a large number of feuds against various enemies, with shifting alliances. In 1469, he supported Landgrave Louis II, Landgrave of Lower Hesse against his brother Henry III, Landgrave of Upper Hesse. On the other hand, in 1464, he supported his own brother, Prince-Bishop Simon III of Paderborn against Louis II of Lower Hesse when they fought the Hesse-Paderborn Feud about Calenberg Castle.