[2] However, academic historians both in Argentina and abroad agree that Rivero's actions were not motivated by patriotism, but by disputes over pay and working conditions with the representatives of Louis Vernet, the former Argentine Political and Military Commander of the islands.Argentine historians generally state he was born in today's Entre Ríos Province, then part of Viceroyalty of the Río de la Plata, now in Argentina.[6] On 26 August 1833, five Indian convicts and three gauchos led by Rivero embarked on a killing spree which resulted in the deaths of Brisbane and the senior leaders of the settlement.[8] I was ordered by them into Captain Brisbane's house, and there first saw his body lying dead upon the floor, he appeared to have been making towards his pistols before he fell, and there was smile of contempt or disdain very strongly marked in his countenance.In January 1834, the British ship HMS Challenger arrived in the islands, bringing Lt. Henry Smith, who set out to capture the murderers, who fled into the interior.Rivero and his associates were responsible for the deaths of five individuals of various nationalities, all employees of Louis Vernet with close links to the United Provinces of the Rio de la Plata.[13] Matthew Brisbane (born in Perth, Scotland in 1787) was a Scottish merchant Captain, sealer and Antarctic explorer who made several voyages to the South Atlantic in the 1820s.He met Louis Vernet in 1827 when chartering a ship to rescue the survivors of the wreck of the Hope, which had run aground off South Georgia under Brisbane's command.This action resulted in the 1831 attack on Port Louis by the American naval sloop the USS Lexington, after which Brisbane and six others were arrested on charges of piracy and taken to Montevideo, where they were released.He was also the nephew of Juan José Paso, an Argentine politician who formed part of the first and second triumvirates that governed the United Provinces of Rio de la Plata during their war of independence.