To the west, by summer 1862 the Union destroyed the Confederate river navy, then much of their western armies, and the 1863 Union siege of Vicksburg split the Confederacy in two at the Mississippi River.
The Union destroyed the Confederate river navy. This was to the west. This was by summer 1862. The Confederate river navy was then much of their western armies. The 1863 Union siege of Vicksburg split the Confederacy in two at the Mississippi River. This was to the west.