this time my intention had been to secure Grand Gulf, as a base of
supplies, detach McClernand's corps to Banks and co-operate with him in
the reduction of Port Hudson.

The news from Banks forced upon me a different plan of campaign from the
one intended. To wait for his co-operation would have detained me at
least a month. The reinforcements would not have reached ten thousand
men after deducting casualties and necessary river guards at all high
points close to the river for over three hundred miles. The enemy would
have strengthened his position and been reinforced by more men than
Banks could have brought. I therefore determined to move independently
of Banks, cut loose from my base, destroy the rebel force in rear of
Vicksburg and invest or capture the city.

Grand Gulf was accordingly given up as a base and the authorities at
Washington were notified. I knew well that Halleck's caution would lead
him to disapprove of this course; but it was the only one that gave any
chance of success. The time it would take to communicate with
Washington and get a reply would be so great that I could not be
interfered with until it was demonstrated whether my plan was
practicable. Even Sherman, who afterwards ignored bases of supplies
other than what were afforded by the country while marching through four
States of the Confederacy with an army more than twice as large as mine
at this time, wrote me from Hankinson's ferry, advising me of the
impossibility of supplying our army over a single road. He urged me to
"stop all troops till your army is partially supplied with wagons, and
then act as quick as possible; for this road will be jammed, as sure as
life." To this I replied: "I do not calculate upon the possibility of
supplying the army with full rations from Grand Gulf. I know it will be
impossible without constructing additional roads. What I do expect is