Coniston massacre
The Coniston massacre, which took place near the Coniston cattle station in the then Territory of Central Australia (now the Northern Territory) from 14 August to 18 October 1928, was the last known officially sanctioned massacre of Indigenous Australians and one of the last events of the Australian Frontier Wars. People of the Warlpiri, Anmatyerre, and Kaytetye groups were killed. The massacre occurred in revenge for the death of dingo hunter Frederick Brooks, killed by Aboriginal people in August 1928 at a place now known as "Yukurru", also known as Brooks Soak.
Cape Grim massacre
On 10 August Robinson encountered convict William Gunchannon, another of the four who had been present at the massacre. Gunchannan admitted his involvement, estimating it had happened about six weeks after the destruction of the sheep, but was reluctant to provide detail. He told Robinson that the Aboriginal group attacked on 10 February had included men and women, but denied knowing whether any had been killed. Robinson later wrote that when he informed him that Chamberlain had already admitted a death toll of about 30, Gunchannan "seemed to glory in the act and said he would shoot them whenever he met them". Robinson did not interview the other two involved in the massacre: Richard Nicholson had previously drowned and John Weavis had since moved to Hobart.