 Complete the following phrase:  The following year, he participated in the Vicksburg Campaign, conducting a raid in Mississippi. Crocker had brought his brigade to a high state of discipline, and it was nicknamed Crockers Greyhounds for its swift marching ability. After the re-enlistment of his brigade as veteran volunteers, he assumed command of a division when General Isaac F. Quinby went on sick leave. Crocker led his division into action at the 