Scottish-born Major Thomas Livingstone Mitchell was Surveyor-General of the Colony of New South Wales from 1827 until his death in 1855. Taking up the post at age 36, he became responsible for a territory that extended from Bass Strait to the middle of Queensland.
It was on his third major survey in 1836 that he crossed the Murray River into what is now Victoria, beginning one of the most important expeditions in Australian settlement history.
Mitchell’s military training set him up as an acute observer of topographical features, and he was an accomplished draftsman. His task on this expedition was to trace the course of the Darling River, which was suspected to eventually run into the Murray, and follow it to its source, surveying land that might prove fertile for pastoral settlement.
With him was a party of Aboriginal guides and white explorers, including convicts, and a team of bullocks. Of particular importance to his expedition was a Wiradjuri man known to Mitchell by the English name of Piper, who originated from Bathurst, New South Wales. Piper assisted the party to move through already settled Aboriginal peoples' lands.
Having traced the Darling to the Murray, Mitchell and his party crossed the mighty river near Swan Hill. As they moved along their trail, they met with many groups of First Australians. Some of these encounters were peaceful, but others were not without bloodshed. A number of Aboriginal people were killed, in particular, by ambush at Mt Dispersion on the Murray in 1836.