LOOK down, fair moon, and bathe this scene;
Pour softly down night's nimbus floods, on faces ghastly, swollen,
purple;
...
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This short poem is symbolic - the dead, lying out in the open (presumably from the Civil War) , surely deserve honor and illumination by the eternal moon.
Jane: I read Whitman’s intention here as ironic. Nature is indifferent to man’s inhumanity to man, disguising and making bearable even the most dreadful of sights.