Cameron Mitchell as General Wallace

William Shatner as Col. Chipman

Jack Cassidy as Otis Baker

Martin Sheen as Captain Williams

Richard Basehart as Henry Wirz

Woodrow Parfrey as Louis Schade

Whit Bissell as Doctor Ford

Buddy Ebsen as Dr. John Bates

John Anderson as Ambrose Spencer

Dick Miller as Sketch Artist

Wright King as Major Hosmer

Harry Townes as Col. Chandler

Lou Frizzell as Jasper Culver

Michael Burns as James Davidson

Albert Salmi as James Gray

Dal McKennon as First Guard

Nino Candido as Second Guard

William Bryant as The Lieutenant

Ray Stricklyn as Court Clerk

Robert Easton as Court Reporter

Philip Bourneuf as Board of Military Judges

Bert Freed as Board of Military Judges

Alan Hale Jr. as Board of Military Judges

Charles McGraw as Board of Military Judges

Ford Rainey as Board of Military Judges

Kenneth Tobey as Board of Military Judges

Ian Wolfe as Board of Military Judges

George C. Scott as Self