 The screenplay was written by Arthur T. Horman, Richard Macaulay, and Norman Reilly Raine, based on a story by Horman and Roland Gillett.The cinematography was by Wilfred M. Cline, Sol Polito, and Winton C. Hoch and was notable in that it was the first feature-length Hollywood production filmed entirely in Canada.The film stars James Cagney and Dennis Morgan as Canadian pilots who do their part in the Second World War, and features Brenda Marshall, Alan Hale Sr., George Tobias, Reginald Gardiner, and Reginald Denny in supporting roles.