John Ford (Director) · James Parker Jr. (Story) · Dudley Nichols (Screenplay)
George O'Brien
Cmdr. Robert 'Bob' Kingsley
Marion Lessing
Anna Marie Von Steuben
Mona Maris
Fraulein Lolita
Walter C. Kelly
Chief Mike 'Guns' Costello
Warren Hymer
'Lug' Kaufman
Steve Pendleton
Ens. Richard 'Dick' Cabot (as Gaylord Pendleton)
Walter McGrail
Chief Joe Cobb
Larry Kent
Lt. 'Mac' McGregor
Henry Victor
Baron Ernst von Steuben (U-boat commander)
John Loder
Franz Shiller
Philip Ahlm
German Chief Petty Officer (uncredited)
Al Bennett
Naval Reservist (uncredited)
Earl Wayland Bowman
Naval Reservist/Swimmer and Diver (uncredited)
Bill Brande
Naval Reservist (uncredited)
William Collier Sr.
Mugs O'Flaherty (uncredited)
Leonard Davison
Naval Reservist (uncredited)
Joseph Depew
Naval Reservist (uncredited)
Francis Ford
Eric - Captain of Trawler (uncredited)
Robert Ford
Naval Reservist (uncredited)
Hans Fuerberg
Fritz Kampf (Second Officer of U-172) (uncredited)
Curt Furberg
Hoffman (uncredited)
Al Generaux
Naval Reservist (uncredited)
Bob Gillette
Naval Reservist (uncredited)
George Golden
Naval Reservist (uncredited)
Ben Hall
Elmer Harrigan (uncredited)
George Harris
Naval Reservist/Swimmer and Diver (uncredited)
Bob Kyle
Naval Reservist (uncredited)
Jack Martin
Naval Reservist (uncredited)
Harry Mount
Bugler on Gun Crew (uncredited)
Jack Murphy
Naval Reservist (uncredited)
Maurice Murphy
Merkel (uncredited)
Bob Nelson
Naval Reservist (uncredited)
Edward Peil Jr.
Naval Reservist (uncredited)
Nat Pendleton
'Butch' Wagner (uncredited)
Terrance Ray
'Skits' Reilly (uncredited)
Marvin Schecter
Gunner (uncredited)
Harry Schultz
German Officer (uncredited)
Ferdinand Schumann-Heink
Adolph Brucker (uncredited)
Robert Shepherd
Naval Reservist (uncredited)
Harry Strang
Gunner and drill sergeant (uncredited)
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In the waning days of WWI, a U.S. "Mystery Ship," sets sail for the coast of Spain towing a submarine. Their mission is to find and sink a U-boat that has been especially effective in attacking Allied shipping. Posing as a harmless schooner, the mystery ship is in fact fitted with a formidable gun capable of sinking a U-boat. Stopping in the Canary Islands to refuel, the crew interacts with locals involved with Germans, and with Germans themselves, including the sister of the U-Boat commander, who is lurking offshore waiting for the coming battle.
