The increasing defense costs fell primarily on the serfs: the rent on the land was raised and extraordinary taxes were imposed. The first peasant revolt in the territory of modern Romania broke out due to the efforts taken by the bishop of Transylvania to collect the church taxes. Led by Anton Budai Nagy, the rebellious peasants, who called themselves "the commune of the rightful Hungarian and Romanian inhabitants of this part of Transylvania", established a fortified camp on the Bobâlna hill early in 1437. They fought two important battles against the noblemen; the first one, at Bobâlna, was won by the peasants, and the second one, near the Apatiu River, had no clear winner. The leaders of the noblemen, the Saxons and the Székelys, however, set up a "brotherly union" in order to join forces and crushed the peasants' resistance by the end of January 1438.