Footage of patrol boats used as U-boat deterrents during the First World War, Baltimore, United States of America.
Baltimore, United States of America
Full titles read: "U.S. SUBMARINE CHASERS - Who searched the seas for treacherous U-boat during the war - now patrol the coast for "Rum Runners"
L/S's of patrol boats and crew in the dock. L/S's Various shots of the small ships at sea.