Ulysses Grant
Tell me
after a lengthy siege
The Union Army.
Pemberton's Confederate Army surrendered unconditionally to Grant's Union Army on July 4,1863.
Ulysses S Grant
Vicksburg was the last big Confederate garrison on the Mississippi. If the Union captured Vicksburg, they would soon control the whole river, and would be able to send most of their troops East, to help the Army of the Cumberland. Meanwhile, all enemy units to the West of the river would be isolated.
The vicksburg Campaign convinced Lincoln that Grant was the right man to lead the whole Union Army.
The Union Army of the Tennessee attacked the Confederate Army of the Mississippi.
Go to the aid of the Army of the Cumberland at Chattanooga.
The armies that fought were the Confederate Army of Mississippi versus the Union Army of the Tennessee.
Complete Control of the Mississippi River.
ANSWER On July 4,1863, when the Confederate Army under General Pemberton capitulated.