 On 26 August 1833, five Indian convicts and three gauchos led by Antonio Rivero embarked on a killing spree which resulted in the deaths of Brisbane and the senior leaders of the settlement.Thomas Helsby, a clerk in the employ of Vernet, wrote an account of the murders.At around ten in the morning, Helsby departed Brisbane's house to buy some oil from William Dickson, whom he found at the house of Antonio Wagner.