sentences:  The rising friction and continuing conflicts between settlers and indigenous Tasmanians led to a declaration of martial law by Lieutenant Governor George Arthur.British regiments came into open conflict with the Aboriginals in what has since been dubbed the "Black War".In 1830, during the "Black Line" incident, groups of armed settlers and even some convicts began a series of military style operations in an effort to push the Tasmanian Aboriginals into a small pocket of land on the Tasman Peninsula in an unsuccessful attempt to isolate them, and prevent further conflicts between the two groups.