The Union Army was divided into many armies throughout the war. They were:
Eastern Theater
Western Theater
The Union Army
Confederate army was the name. They were also called Rebels too.
The Union Army. wasn't it the Union Arny?
Potomac
they wore a blue coat,pants and hat they were called the union army
It was called The Army of The Potomac.
the red army
The Rebels.
Yankees
They fought for the United States (the Union) as opposed to the Confederate States (Confederacy.)
There were at times several Union armies operating in the Eastern Theater of the US Civil War. The main one was the Army of the Potomac. Other Union armies in the east were the Army of the James, and the Army of Virginia.
The Union