Red Badge of Courage. Quick Question.? I'm doing a color imagery paper and Crane refers to the regiment as a "blue demonstration." Why blue?And what does that mean?- Anonymous1 decade agoFavorite AnswerBlue = Union ArmyGrey = Confederate Army- aidaLv 71 decade ago As Union soldiers, they wore blue uniforms, so I assume that the "blue demonstration" was simply the regiment, drilling or perhaps marching in formation as a show of strength. Source(s): Retired English professor