The Civil War began in 1861 following the Confederate attack on Fort Sumter in South Carolina. As the Union and Confederacy prepared for war, volunteers joined both armies despite shortages of supplies. Major battles were fought in the East, including Bull Run, the Seven Days Battle, Antietam, and in the West as Grant sought to control the Mississippi River through battles at Shiloh, New Orleans, and Vicksburg. The Emancipation Proclamation freed slaves in Confederate states in 1863, and over 180,000 African Americans served in the Union army, though Lincoln faced opposition to the war from Copperheads in the North.