Americans. Sam Hall, a self proclaimed mercenary hero and "counter-terrorist" who joined the CMA entered Nicaragua with the aim of performing sabotage operations. In 1986, Hall was captured by the Sandinistas, who held him for four months before releasing him under the grounds that he was not a mercenary, but rather a mercenary imposer. John K. Singlaub who worked alongside Hall described him as suffering from a "Walter Mitty type complex". Colombia In 1994, President César Gaviria of Colombia signed Decree 356, which allowed wealthy landowners to recruit private armies of their own and liberalised the law on settling up PMCs in order to fight the Communist FARC (Fuerzas Armadas Revolucionarias de Colombia – Revolutionary Armed Forces of Colombia) guerrillas. As a result of Decree 356, by 2014 Colombia had 740 PMCs operating, more than anywhere else in the world. Increasingly Colombian mercenaries have been hired by American PMCs as being cheaper than American mercenaries. The government of the United Arab Emirates has hired Colombian mercenaries to fight its war in Yemen. Africa Ancient Africa An early recorded use of foreign auxiliaries dates back to Ancient Egypt, the thirteenth century BC, when Pharaoh Ramesses II used 11,000 mercenaries during his battles. A long established foreign corps in the Egyptian forces were the Medjay—a generic term given to tribal scouts and light infantry recruited from Nubia serving from the late period of the Old Kingdom through that of the New Kingdom. Other warriors recruited from outside the borders of Egypt included Libyan, Syrian and Canaanite contingents under the New Kingdom and Sherdens from Sardinia who appear in their distinctive horned helmets on wall paintings as body guards for Ramesses II. Celtic mercenaries were greatly employed in the Greek world (leading to the sack of Delphi and the Celtic settlement of Galatia). The Greek rulers of Ptolemaic Egypt, too, used Celtic mercenaries. Carthage was unique for relying primarily on mercenaries to fight its wars, particularly Gaul and Spanish mercenaries. 19th and 20th centuries In the 20th century, mercenaries in conflicts on the continent of Africa have in several cases brought about a swift end to bloody civil war by comprehensively defeating the rebel forces. There have been a number of unsavory incidents in the brushfire wars of Africa, some involving recruitment of European and American men "looking for adventure". Many of the adventurers in Africa who have been described as mercenaries were