The red badge of courage : an episode of the American Civil War / Stephen Crane.

Enhanced descriptions from Syndetics:

THE cold passed reluctantly from the earth, and the retiring fogs revealed an army stretched out on the hills, resting. As the landscape changed from brown to green, the army awakened, and began to tremble with eagerness at the noise of rumors. It cast its eyes upon the roads, which were growing from long troughs of liquid mud to proper thoroughfares. A river, amber- tinted in the shadow of its banks, purled at the army's feet; and at night, when the stream had become of a sorrowful blackness, one could see across it the red, eyelike gleam of hostile camp-fires set in the low brows of distant hills. Once a certain tall soldier developed virtues and went resolutely to wash a shirt. He came flying back from a brook waving his garment bannerlike. He was swelled with a tale he had heard from a reliable friend, who had heard it from a truthful cavalryman, who had heard it from his trustworthy brother, one of the orderlies at division headquarters. He adopted the important air of a herald in red and gold. "We're goin' t' move t' morrah - sure," he said pompously to a group in the company street. "We're goin' 'way up the river, cut across, an' come around in behint 'em."