The army of northern Virginia invaded Maryland and was defeated here in September of 1862 by the army of the Potomac. The battle was the single bloodiest day of the civil war.

A) Vicksburg
B) Gettysburg
C) Sharpsburg
D) Fredricksburg

B - Gettysburg

Explanation:

The battle of Gettysburg is known as the bloodiest day, so it has to be Gettysburg.

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explanation:

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