The conditions upon which the Ohlone joined the Spanish missions are subject to debate. Some have argued that they were forced to convert to Catholicism, while others have insisted that forced baptism was not recognized by the Catholic Church. All who have looked into the matter agree, however, that baptized Indians who tried to leave mission communities were forced to return. The first conversions to Catholicism were at Mission San Carlos Borromeo, alias Carmel, in 1771. In the San Francisco Bay area the first baptisms occurred at Mission San Francisco in 1777. Many first-generation Mission Era conversions to Catholicism were debatably incomplete and "external".