On May 22, 1863 General Ulysses S. Grant began the siege on Vicksburg.
"May 22. Early in the morning, Union artillery opens fire and for four hours bombards the city's defenses. At 10 a.m. the guns fall silent and Union infantry advances on a three-mile front. Sherman attacks again down the Graveyard Road, Maj. Gen. James B. McPherson’s Corps move against the center along the Jackson Road, and Maj. Gen. John A. McClernand’s Corps attack to the south at the Second Texas Lunette and the Railroad Redoubt, where the Southern Railroad crosses the Confederate lines. Surrounded by a ditch 10 feet deep and walls 20 feet high, the redoubt offers enfilading fire for rifles and artillery. After intense hand-to-hand fighting, Federals breach the Railroad Redoubt, capturing a handful of prisoners. The victory, however, is the only Confederate position captured that day.
Grant’s unsuccessful attacks give him no choice but to invest Vicksburg in a siege. As weeks go by, Pemberton’s defenders suffer from shortened rations, exposure to the elements, and constant bombardment from Grant’s army and navy gunboats. Reduced in number by sickness and casualties, the garrison of Vicksburg is spread dangerously thin. Civilians are hard hit, with many forced to live in crudely dug caves due to the heavy shelling."