Union Admiral David D Porter took seven ironclads up the river in an attack against the batteries at Grand Gulf, Mississippi. The attention was to shut down the Confederate guns and secure the landing area for troops of Union Major General John A McClernand. At about 8am the ironclads began the attack and continued to fire on the Confederate batteries until about 1:30 pm. The ships silenced the guns of Fort Wad, but the upper Confederate batteries at Fort Cobun continued their return fire. The Union ironclads drew off, but returned again after dark engaging the Confederate gun, and running the steamboat troop transports down the river past Grand Gulf.
Grant moved his men overland below Grand Gulf across Coffee Point. The transport ships landed at Disharoon’s plantation just below Grand Gulf. Grant’s men loaded onto the transport. They disembarked on the Mississippi shore and began marching overland towards Port Gibson, Mississippi.