A more difficult problem was that the film had to be shot with the actors artificially positioned out of dramatic and emotional frame, and out of synchronization with one another. Only when the three-print Cinerama process was projected upon a Cinerama screen did the positions and emotions of the actors synchronize—such as normal eye contact or emotional harmony between actors in a dramatic sequence. Because of the nature of Cinerama, if the film were shown in flat-screen projection, it would appear as if the actors made no eye contact, at all. One brief scene of Mexican soldiers was generously sourced by John Wayne from the 1960 version of "The Alamo", in which he starred, produced, and directed.