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The working title of this film was The Invisible Army. The opening credits include film clips of actual prisoners-of-war freed from the Japanese prison camp at Cabanatuan on January 30, 1945. An onscreen prologue states, "This story was not invented. The events you are about to see are based on actual incidents. The characters are based on real people..." A Hollywood Reporter news item adds that Col. George S. Clarke, the film's technical advisor, was the commander of the U.S. Infantry Philippine Scouts. According to materials contained in the RKO Archives Script Files at the UCLA Arts Library-Special Collections, a draft of the script dated September 10, 1944 originally ended with the American officer "Madden" leading an attack against the Japanese. According to a news item in the LA Daily News, John Wayne, who played "Madden," and producer Robert Fellows opposed making the American officer the hero, arguing that a Filipino character should be the film's hero. The Daily News article and a news item in Hollywood Reporter note that the film was nearing completion in 1944 when the Americans landed on the island of Leyte to launch their invasion of the Philippines and defeat the Japanese. At that time, RKO decided to change the film's ending to coincide with current events. The Daily News states that the studio hired Ben Barzman to write the new ending in which the Filipino officer, "Capt. Bonifacio," experiences a renewal of his faith on the beach at Leyte and leads his forces to victory. Barzman, however, is not credited in any of the manuscripts contained in the RKO Archive Script Files. Although a Hollywood Reporter production chart adds Robert Stevens to the cast, his participation in the released film has not been confirmed. Another news item in Hollywood Reporter notes that some of the location scenes were filmed at the Baldwin Estate near Santa Anita, CA. Anthony Quinn was borrowed from Twentieth Century-Fox to appear in this picture. According to a news item in Hollywood Citizen-News, the proceeds from the Los Angeles premiere were donated to a special war fund. This picture was unrelated to the 1943 M-G-M film Bataan .