A Union Army Officer was a military leader in the Union Army, which fought for the Northern states during the American Civil War from 1861 to 1865. These officers were responsible for leading troops, making strategic decisions, and ensuring the welfare of their soldiers. They held various ranks, from lieutenants to generals, and played a crucial role in battles and military campaigns. Union Army Officers were often educated and trained in military tactics, and many had prior experience in the U.S. Army or other military organizations. Their leadership was vital in achieving key victories, such as the Battle of Gettysburg and the Siege of Vicksburg, which helped shape the outcome of the war.