During the American Civil War, the United States Army, the land force that fought to preserve the collective Union of the states, was often referred to as the Union army, Federal army, or Northern arm
Recruiting poster for the 1st New York Mounted Rifles Regiment
General George B. McClellan with staff and dignitaries, including from left to right: Gen. George W. Morell, Lt. Col. A.V. Colburn, Gen. McClellan, Lt. Col. N.B. Sweitzer, Prince de Joinville (son of King Louis Philippe of France), and the prince's nephew, Count de Paris (on far right)
The champions of the Union, an 1861 lithograph by Currier and Ives
Officers of the 3rd Massachusetts Heavy Artillery Regiment defending the national capital of Washington, D.C., in 1865, the final year of the Civil War
The western theater of the American Civil War encompassed major military operations in the states of Alabama, Georgia, Florida, Mississippi, North Carolina, Kentucky, South Carolina and Tennessee, as
Lt. Gen. Ulysses S. Grant, USA
Maj. Gen. Henry W. Halleck, USA
Maj. Gen. William T. Sherman, USA
Maj. Gen. George H. Thomas, USA