- James Dunn
- Lt. Kenneth Reynolds
- Mae Clarke
- Constance Jordan
- David Manners
- Raymond Jordan
- Charlotte Henry
- Julie Buchanan
- Henry B. Walthall
- Capt. Buchanan
- Fritz Leiber
- Capt. John Ericsson
- George Irving
- Commodore Jordan
- Irving Pichel
- Secretary of War Sumner Gideon Welles
- J.M. Kerrigan
- Paddy Callahan
- Frank McGlynn Sr.
- Abraham Lincoln
- Ben Alexander
- Eggleston
- Oscar Apfel
- Capt. Gilman
- Clay Clement
- Lt. Worden
- Edward Gargan
- 'Mac' McPherson
- Russell Hicks
- Sen. Pillsbury
- George 'Gabby' Hayes
- Ezra
- Douglas Wood
- Commodore David G. Farragut
- Bodil Rosing
- Mrs. Adams
- Erville Alderson
- Jefferson Davis
- John Hyams
- Bushnell
- Etta McDaniel
- Mammy
- Hooper Atchley
- Lt. Greene
- Maurice Brierre
- French Waiter
- Sonny Bupp
- Boy
- Smiley Burnette
- Rammer
- Bob Card
- Soldier with Flute
- Horace B. Carpenter
- Townsman
- Allan Cavan
- Head of Court Martial Board
- Lane Chandler
- Lt. Gates Jones
- Sally Conlin
- (uncredited)
- Marc Cramer
- Merrimac Seaman
- Earl Eby
- (uncredited)
- Jack Evans
- Confederate Sailor
- Pat Flaherty
- Bucko's Friend
- Herman Hack
- Confederate Sailor
- Lloyd Ingraham
- Timekeeper
- Jack Ingram
- Union Sentry
- Eugene Jackson
- Sam
- Charles King
- Merrimac Seaman
- Ethan Laidlaw
- Union Seaman
- Frankie Marvin
- Gunner
- Robert Paige
- Union Lt. Evans
- Warner Richmond
- Bucko
- Henry Roquemore
- Sec. Stanton
- Clinton Rosemond
- Jordan's Servant
- Helen Seamon
- (uncredited)
- Harry Strang
- Monitor Helmsman
- Charles Unger
- (uncredited)
- Arthur Wanzer
- (uncredited)
- Cecil Watson
- Southern Townswoman
- Wally West
- Confederate Officer
- Clifton Young
- Young man waiting to enlist
