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The Union men at Front Royal were the 1st Maryland. Jackson also had a regiment of 1st Maryland (Confederate). Maryland was a border state, and like all border states, it had regiments in both armies. This was the case with the Southern states as well. When the war broke out, loyalists from all across the South formed their own Union regiments. These were often quickly crushed, or had to flee to the North and fight far from their home territories.
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Charles River Editors (The Stonewall Brigade: The History of the Most Famous Confederate Combat Unit of the Civil War)