 The only shots fired were a 21-gun salute to the new U.S. flag fired by each of the U.S. Navy ships in the harbor.The British ships observed but took no action.The abandoned Presidio and Mission San Francisco de Asís (Mission Dolores) at San Francisco, then called Yerba Buena, were occupied without firing a shot on July 9, 1846, by U.S. marines and U.S. Navy sailors from the sloop .