At this "turning point" battle, the Union won a decisive victory by dividing the Confederacy along the Mississippi River. It was a victory that cemented the reputation of Union general Ulysses S. Grant.
The battle referred to in the question is the Battle of Vicksburg which was fought from May to July 1863. Union forces under Ulysses S. Grant laid siege to the Confederate stronghold of Vicksburg, Mississippi, eventually forcing its surrender. The victory was a turning point in the Civil War, as it gave the Union control of the Mississippi River, splitting the Confederacy in two and cutting off important supply lines. The success at Vicksburg also solidified Grant's reputation as a skilled and effective military leader.
