Civil War By Kalvin-Man Jul 21, 1861 First Battle of Bull Run Largest Amount of Troops involved in battle Mar 26, 1862 Glorieta Pass Start of War Apr 6, 1862 Shiloh Bloodiest Battle of the war Apr 30, 1863 Chancellorville Union Victory that split the Confederacy in half May 18, 1863 Vicksburg Bloodiest day in american history Apr 9, 1865 Appomattox End of War