The One Hundredth Regiment, also known as the 100th Ohio Infantry, was a unit in the Union Army during the American Civil War. Formed in 1862, it participated in several key battles, including the Battle of Vicksburg and the Battle of Chattanooga. The regiment was known for its bravery and commitment to the Union cause. The regiment was composed mainly of soldiers from Ohio and played a significant role in various military campaigns. After the war, many members returned to their communities, contributing to the post-war recovery and development of the United States.