Political map of North America & the Caribbean 07 April 1862 (Battle of Shiloh): Moving through Kentucky down the Tennessee River (Battle of Fort Henry), the US took the fight in the west to the Confederacy (Western Theater of the American Civil War). In an attempt to prevent the Union from invading Mississippi, the Confederates launched a surprise attack on advanced columns at Shiloh (Battle of Shiloh), only to be beaten back when reinforcements arrived.