After the Battle of Arkansas Post, Grant regained command of Sherman's force, the reorganized XV Corps, and also of McClernand, who kept command of the XIII Corps. Colonel Rutherford and his 97th Illinois Infantry Regiment, was still with Colonel Landram's brigade, now the 2nd Brigade in Brigadier General Andrew Jackson Smith's 10th Division. The 97th Illinois Infantry Regiment took part in the Battle of Port Gibson on May 1, 1863. After taking some bluffs without resistance, the Union force was slowed by a Confederate flanking assault. Reinforced by Brigadier General John A. Logan's division of Major General James B. McPherson's corps, the Union Army division of Brigadier General Peter Osterhaus of McClernand's corps attacked the Confederate right blank and made the position held by Confederate Brigadier General Martin Green untenable. Confederate commander Major General John Bowen withdrew his outnumbered force from Port Gibson that night.