The Serbian hajduks (Serbian: хајдуци, hajduci) were brigands and guerrilla fighters (rebels) throughout Ottoman-held Balkans, organized into bands headed by a harambaša ("bandit leader"), who descended from the mountains and forests and robbed and attacked the Ottomans. They were often aided by foreign powers, the Republic of Venice and Habsburg Monarchy, during greater conflicts. The hajduk movement is known as hajdučija (хајдучија) or hajdukovanje (хајдуковање). Ranks included buljubaša and harambaša, adopted from the Ottomans.