The Northern Army refers to the military forces that operated in the northern regions during various historical conflicts, most notably during the American Civil War. This army was primarily associated with the Union side, fighting against the Confederate states. It played a crucial role in key battles and campaigns, contributing to the preservation of the United States. In the context of the American Civil War, the Northern Army included several significant units, such as the Army of the Potomac. Commanded by various generals, including George Meade and Ulysses S. Grant, it aimed to defeat the Confederate forces and restore the Union.