Vicksburg Campaign - Plan For The 1863 Campaign and Initial Movements

Plan For The 1863 Campaign and Initial Movements

All of the Bayou Operations were failures, but Grant was known for his stubborn determination and would not quit. His final option was bold but risky: March the army down the west side of the Mississippi, cross the river south of Vicksburg, and either attack Vicksburg from the south and the east or join forces with Banks, capture Port Hudson, and then together reduce Vicksburg. Porter would have to sneak past the guns to get sufficient gunboats and transport ships south of the city. Once they had completed the downstream passage, they would not be able to return past Vicksburg's guns because the river current would slow them too much.

On March 29, McClernand set his troops to work building bridges and corduroy roads. They filled in the swamps in their way as well, and by April 17 they had a rough, tortuous 70-mile (110 km) road from Milliken's Bend to the proposed river crossing at Hard Times, Louisiana, below Vicksburg.

On April 16, a clear night with no moon, Porter sent seven gunboats and three empty troop transports loaded with stores to run the bluff, taking care to minimize noise and lights. But the preparations were ineffective. Confederate sentries sighted the boats, and the bluff exploded with massive artillery fire. Fires were set along the banks to improve visibility. The Union gunboats answered back. Porter observed that the Confederates mainly hit the high parts of his boats, reasoned that they could not depress their guns, and had them hug the east shore, right under Confederate cannon, so close he could hear their commanders giving orders, shells flying overhead. The fleet survived with little damage; thirteen men were wounded and none killed. The Henry Clay was disabled and burned at the water's edge. On April 22, six more boats loaded with supplies made the run; one boat did not make it, though no one was killed—the crew floated downstream on the boat's remnants.

The final piece of Grant's strategy was to divert Pemberton's attention from the river crossing site that the Union troops would use. Grant chose two operations: a feint by Sherman against Snyder's Bluff, Mississippi, north of Vicksburg (see the Battle of Snyder's Bluff below), and a daring cavalry raid through central Mississippi by Col. Benjamin Grierson, known as Grierson's Raid. The former was inconclusive, but the latter was a success. Grierson was able to draw out significant Confederate forces to chase him, and Pemberton's defenses were dispersed too far around the state. (Pemberton was also wary of Nathaniel Banks's impending advance up the river from Baton Rouge to threaten Port Hudson.)