The Union wore blue.
The Confederates wore grey.
In the First Battle of Bull Run, one of the Confederate units wore blue, and Northern gunners failed to open fire on them till too late. Some say this cost them a Northern victory.
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Most wore a dark blue or a sky blue uniform.
The Union uniform was blue, the Confederacy uniform was gray. Other than the color, the clothing was quite simple and ordinary. Uniforms were not elaborate.
The Southern (Confederate) Army wore grey uniforms.
The Unionists wore blue or sky blue uniform. The Confederates wore grey and also, after the early stage of the war, "butternut" uniforms.
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