In 1959 some members of the Liberal Party and the Febreristas in exile in Argentina formed a guerrilla group called 14 de Mayo M14 and planned a series of attacks to the government installations. Some of them were veterans of the Chaco War with military training but the rest were not trained at all. They got some weapons through donations of exiled supporters and ammunition explosives and radio equipment from the Argentinean Army. On 12th December of that year five rebel columns totaling 250 ef