The Black War was a period of violent conflict between British colonists and Aboriginal Tasmanians in Tasmania from the mid-1820s to 1832 that precipitated the near-extermination of the indigenous population. The conflict was fought largely as a guerrilla war by both sides; some 600 to 900 Aboriginal people and more than 200 British colonists died.
When a British penal settlement was established in Tasmania (then called Van Diemen's Land) in 1803, the Aboriginal population was 3,000 to 7,000 people. Until the 1820s, the British and Aboriginal people coexisted with only sporadic violence, often caused by settlers kidnapping Aboriginal women and children. Conflict intensified from 1824, as Aboriginal warriors resisted the rapid expansion of British settlement over their land. In 1828, the British declared martial law and in 1830 they unsuccessfully attempted to force hostile Aboriginal nations from the settled districts in a military operation called "the Black Line". In a series of "Friendly Missions" in 1830 and 1831, George Augustus Robinson and his Aboriginal negotiators secured the surrender of the Aboriginal belligerents. Martial law was revoked in January 1832.