I muri i te Pakanga o Arkansas Post, ka riro ano i a Grant te mana o te kaha o Sherman, te XV Corps kua whakahoutia, me McClernand hoki, i pupuri i te mana o te XIII Corps. Ko Colonel Rutherford me tana 97th Illinois Infantry Regiment, kei te pirihimana tonu a Colonel Landram, inaianei ko te 2nd Brigade i roto i te 10th Division a Brigadier General Andrew Jackson Smith. I uru te 97th Illinois Infantry Regiment ki te Pakanga o Port Gibson
i te 1 o Mei 1863. I muri i te tango i etahi tinihanga kaore he aukati, ka whakaroa te kaha o te Uniana e te whakaeke a te Rōpū. I whakapakarihia e te wehenga a Brigadier General John A. Logan o te roopu a Major General James B. McPherson, ko te wehenga a te Ope Taua o te Uniana o Brigadier General Peter Osterhaus o te roopu a McClernand i whakaeke i te tika o te Confederate me te hanga i te tuunga a te Confederate Brigadier General Martin Green kaore e taea te pupuri. Ko te rangatira o te Rōpū Rōpū, ko John Bowen, i wehe atu i tana ope i Port Gibson i taua po.