In early 1969 the Minas Gerais branch of Colina had only a dozen militants, little money, and few weapons. Its activities boiled down to four bank robberies, some stolen cars and two bombings, with no casualties. On 14 January, after some arrests during a bank robbery, they gathered to debate what to do to release them from jail. At dawn, the police invaded the group's house and they responded by using a machine gun, which killed two policemen and wounded another.