Rubuta ci gaba ga wannan sakin layi - A ranar 1 ga Mayu, rundunar ta yi yaƙi a yakin Port Gibson
, inda shi da 3rd Missouri Infantry Regiment suka caje layin Union a kokarin kokarin juyawa abokan gaba. Duk da haka, ƙungiyoyi biyu sun rasa buga Union line a gefen, kuma a maimakon haka ya buga wani yanki tare da mafi girma goyon baya. Bayan gwagwarmayar gwagwarmaya, an tilasta wa sojojin biyu su janye. Ranar 16 ga watan Mayu, rundunar ta shiga babban hari a yakin Champion Hill. Rundunar ta Tarayya a Champion Hill ta kama abubuwa biyu masu muhimmanci a fagen fama, amma ƙarfafawar Union da rashin bindigogi ya tilasta wa maza su koma baya. Bayan da aka kaddamar da shi a yakin Big Black River Bridge a ranar 17 ga watan Mayu, rundunar ta shiga cikin kare Vicksburg, Mississippi. A lokacin Siege na Vicksburg, rundunar ta taimaka wajen kawar da hare-haren Union a ranar 19 ga Mayu da 22 ga Mayu. A ranar 25 ga Yuni da 1 ga Yuli, rundunar ta yi tsayayya da yunƙurin Union don karya layin Confederate ta hanyar fashewar baƙar fata a ƙarƙashin ayyukan tsaro na Confederate. Rundunar sojojin Tarayyar Vicksburg ta mika wuya a ranar 4 ga watan Yuli, kuma an ba da izini ga mazajen 5th Missouri Infantry. Bayan an musayar, an hada 5th Missouri Infantry tare da 3rd Missouri Infantry don samar da 3rd da 5th Missouri Infantry Regiment (Consolidated); 5th Missouri Infantry ya daina wanzuwa a matsayin wani sashi.