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According to March 1959 Hollywood Reporter news items, Yesterday's Enemy was part of a deal between Hammer Film Productions, Ltd. and Columbia Pictures Corp. that stipulated that Hammer would co-produce five films per year for Columbia over a period of five years. Columbia had previously acquired a 49% interest in Hammer's Bray Studios, and under this new arrangement, was to provide 50% of the financing for the co-productions.
Although a Hollywood Reporter news item and the Variety review noted that British writer Peter R. Newman adapted his play for the screen, other sources indicate that Yesterday's Enemy was based on an original story and screenplay by Newman. Modern sources add Barry Foster to the cast.