How does Stephen Crane use imagery in The Red Badge of Courage?

Crane uses color imagery, both vibrant and subtle, to describe war. He describes a skirmish as sounding like a "crimson roar," for example, and writes of war as "the red animal." Crane's sense of color pervades the work; note his description of the sky, which remains "fairy blue" during the day, as if to underscore the indifference of nature to the carnage taking place.