Final answer:
During the siege of Vicksburg in 1863, the Union Army, commanded by Major General Ulysses S. Grant, conducted a successful siege to gain control of the Mississippi River and split the Confederacy.
Step-by-step explanation:
The subject of your question is History. During the siege of Vicksburg in 1863, the Union Army, commanded by Major General Ulysses S. Grant, laid siege to the city to gain control of the Mississippi River and split the Confederacy. The Union forces surrounded Vicksburg, cut off its supplies, and conducted a well-conducted siege that resulted in the surrender of the Confederate forces. This victory was a significant blow to the Southern war effort.