Original sentence: In San Francisco, Fort Point was built at the edge of the Presidio, as well as Fort Baker on the Marin Headlands.New forts were founded to protect ports, defend against the Indians, and to hold Confederate soldiers and sympathizers, such as the Drum Barracks, in San Pedro Bay and at Two Harbors on Catalina Island.San Pedro was protected from January 1862 by Camp Drum later the Drum Barracks.The coastal fortifications of San Pedro, and the San Diego and San Francisco Bays were also important
Edited sentence: As the conflict begaan, new forts were founded to protect ports, defend against the Indians, and to hold off Confederate soldiers and sympathizers.In San Francisco, coastal fortifications atFort Point were built at the edge of the Presidio, as well as at Fort Baker on the Marin Headlands.Of the ports, San Francisco Bay was the most important.San Diego was only defended by a small garrison at the New San Diego Depot occupied in 1860.San Pedro was protected from January 1862 by Camp Drum later the Drum Barracks and later a post was established at Two Harbors on Catalina Island