One of the leaders of the mercenaries was Costas Georgiou (the self-styled "Colonel Callan"), who was described by the British journalist Patrick Brogan as a psychopathic killer who personally executed fourteen of his fellow mercenaries for cowardice, and who was extremely brutal to black people. Within 48 hours of his arrival in Angola, Georgiou had already led his men in disarming and massacring a group of FNLA fighters (his supposed allies), who he killed just for the "fun" of it all. At his trial, it was established that Georgiou had personally murdered at least 170 Angolans. Inept as a military leader as he was brutal, Georgiou notably failed as a commander. It was believed in 1975–76 that recruiting white mercenaries to fight in Angola would have a similar impact that the mercenaries had in the Congo in the 1960s, but in Angola the mercenaries failed completely as Brogan described their efforts as a "debacle". If anything, the white mercanaries with their disdain for blacks, or in the case of Georgiou murderous hatred seemed to have depressed morale on the FNLA side. Many of the mercenaries in Angola were not former professional soldiers as they claimed to have been, but instead merely fantasists who had invented heroic war records for themselves. The fantasist mercenaries did not know how to use their weapons properly, and often injured themselves and others when they attempted to use weaponry that they did not fully understand, leading to some of them being executed by the psychopathic killer Georgiou who did not tolerate failure. On 27 January 1976, a group of 96 British mercenaries arrived in Angola and within a week about dozen had accidentally maimed themselves by trying to use weapons that they falsely claimed to be proficient with. The MLPA forces were better organized and led, and the dispatch of 35, 000 Cuban Army troops in November 1975 decided the war for the MLPA. Cuban accounts of the Angolan war speak of the efforts of the mercenaries in a tone of contempt as Cuban veterans contend that the mercenaries were poor soldiers who they had no trouble defeating. When captured, John Derek Barker's role as a leader of mercenaries in Northern Angola led the judges to send him to face the firing squad. Nine others were imprisoned. Three more were executed: American Daniel Gearhart was sentenced to death for advertising himself as a mercenary in