Example image of eyePlorer eyePlorer map for 'Union Army': American Civil War Union (American Civil War) Conscription Regular Army (United States) United States Army Confederate States Army African American Indigenous peoples of the Americas Southern United States Artillery Cavalry Dragoon Infantry Mounted infantry Regiment Atlantic Ocean Mississippi River Western United States Abraham Lincoln Confederate States of America President of the United States Secession United States Congress Abolitionism French American German American New York Pennsylvania United States Military Academy Virginia The Citadel, The Military College of South Carolina Virginia Military Institute Army of the Cumberland Department of the Pacific Department of the West Military Division of the Mississippi Theater (warfare) George Henry Thomas Georgia (U.S. state) Tennessee William Rosecrans Army of Georgia Henry Warner Slocum Army of the Gulf Benjamin Franklin Butler (politician) Edward Canby Gulf of Mexico Nathaniel Prentice Banks Army of the James Edward Ord