United States Army The United States Army is a service branch of the United States Armed Forces that specializes in ground-based offensive and defensive warfare. The mission of the United States Army is to fight and win our Nation's wars, by providing prompt, sustained, land dominance, across the full range of military operations and the spectrum of conflict, in support of combatant commanders.The United States Army we know today has roots that can be traced back to the Continental Army which was formed in 1775 during the American Revolutionary War. After the War, The Congress of the Confederation officially created the United States Army in 1784 to replace the disbanded Continental Army. The United States Army is the largest military branch of the armed forces in which participates in disputes worldwide today through preserving peace and security and providing for the defense of the United States.
Union Army The Union Army was a section of the United States Army that fought during the Civil War to preserve the Union of the collective states. It was made up of members of the United States Army and also units of volunteers and those drafted for service. Throughout the war, over 2 million men enlisted in the Union Army and roughly a quarter of them were killed, wounded, or went missing. In 1865, the Union Army won the Civil War when General Robert E. Lee surrendered to General Ulysses S. Grant.