Ohio in the American Civil War Ohio in the American Civil War During the American Civil War, the State of Ohio played a key role in providing troops, military officers, and supplies to the Union army. Due to its central location in the Northern United States and burgeoning population, Ohio was both politically and logistically important to the war effort. Despite the state's boasting a number of very powerful Republican politicians, it was divided politically. Portions of Southern Ohio followed the Peace Democrats and openly opposed President Abraham Lincoln's policies. Ohio played an important part in the Underground Railroad prior to the war, and remained a
Western Theater of the American Civil War formally surrendered his force on May 9. Wilson's cavalry officially took control of Tallahassee, Florida, on May 20, the last Confederate state capital east of the Mississippi to be captured, completing the Western Theater operations. A detachment of Wilson's cavalry captured Confederate President Jefferson Davis on May 10 near Irwinville, Georgia. The costliest land battles in the western theater, measured by casualties (killed, wounded, captured, and missing), were: Western Theater of the American Civil War The Western Theater of the American Civil War encompassed major military operations in the states of Alabama, Georgia, Florida, Mississippi, North Carolina, Kentucky, South Carolina