Confederate states and the union states
The northern soldiers were simply called the Union (which was also the name describing the northern states), while the southern soldiers were called Confederates (after the name that described the states that broken away in 1861, the Confederate States of America.)
EDIT:
The soldiers of the North were known as the Yankees. They were often referred to as "Billy Yanks" by their enemies from the South.
The soldiers of the South were known as the Rebels. "Johnny Rebs" became their nickname by the Union armies of the North.
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Union soldiers were called Federals, Yankees, Blue bellies, Abolitionists, Billy Yanks.Confederates were called Rebels, Butternuts, Johnnies (or Johnny Rebs), Secesh.
If you are reffering to the Civil War they were called the Union Army. They were also known as Yankees. Yankees
Bob
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Confederate army was the name. They were also called Rebels too.
The Union army (or armies)
German soldiers during World War I were called "Huns" by the American soldiers. The Germans called their soldiers "The Bosch" during World War I.