The Union Army was the army that fought for the Union during the American Civil War. It was also known as the Federal Army, the U.S. Army, the Northern Army and the National Army. It consisted of the small United States Army (the regular army), augmented by massive numbers of units supplied by the Northern states, composed of volunteers as well as draftees. The Union Army fought and defeated the Confederate States Army during the war, from 1861 to 1865. Of the 2.5 million men who served in the Union Army during the war, about 360,000 died—in combat, from injuries sustained in combat, disease or other causes — and 280,000 were wounded.
- See, for example, usage in Grant, Preface p. 3.