Blooper - Getting back on that horse!! SPOILER!!!!!!
Although I have seen "The Horse Soldiers" numerous times throughout the years (having first watched it as an eight year old in a theater), the one scene that I find really ironic and most surprising that it wasn't called for a retake was the following:
When the military cadets march upon John Wayne and company and keep advancing, there comes a time when Wayne (Colonel Marlowe) is asked what he intends to do, and he said, "Get the hell out of here." As "Dixie" soars on the soundtrack, watch the good Colonel try to get on the horse. Three times without success, cut to another scene and when the action returns to John Wayne he is on his horse and doffed his hat at the cadets.
However, he had no such trouble getting on the horse after putting the cigar to the trail of gunpowder before the bridge blows up at the end of the film.