The San Francisco mission, situated on the left bank of the Casiquiare, was named after one of the leaders of the boundary expedition, Don Joseph Solano. This educated officer never got any further than San Fernando de Atabapo; he had never seen the Río Negro waters or the Casiquiare, or the Orinoco east of the Guaviare. Ignorance of the Spanish language drove geographers to locate erroneously on the famous La Cruz Olmedilla map the 400 league route made by Joseph Solano to the sources of the Orinoco. The San Francisco mission was founded not by monks but by military authorities. Following the boundary expedition, villages were built wherever an officer or a corporal stopped with his soldiers. Some of the Indians withdrew and remained independent; others, whose chiefs were caught, joined the missions. Where there was no church they were happy to raise a great red wooden cross, and to build a casa fuerte, that is, a house with long beams placed horizontally on top of each other, next to it. This house had two floors; upstairs were placed small cannons; downstairs two soldiers lived, served by Indian families. Tamed Indians established themselves around the casa fuerte. In the event of an attack soldiers would gather the Indians together by sounding the horn, or the baked-earth botuto. These were the nineteen so-called Christian establishments founded by Don Antonio Santos. Military posts had no effect in civilizing the Indians living there. They figured on maps and in mission works as pueblos (villages) and as reducciones apostòlicas.