After the Battle of Champion's Hill John McClernand's corps chased the remaining confederates towards Vicksburg, on May 17th of 1863, they arrived at the rebel defenses in front of the Big Black River.
They arrived at the rebel defenses in front of the Big Black River. The Battle of Champion's Hill John McClernand's corps chased the remaining confederates towards Vicksburg. This was on May 17th of 1863.