Twelfth Iowa).

The Fourth, commanded by Brigadier-General Hugh Ewing, was composed
of three brigades, led by Brigadier-General J. M. Corse, Colonel
Loomis (Twenty-sixth Illinois), and Colonel J. R. Cockerill (of the
Seventieth Ohio).

On the 22d day of September I received a telegraphic dispatch from
General Grant, then at Vicksburg, commanding the Department of the
Tennessee, requiring me to detach one of my divisions to march to
Vicksburg, there to embark for Memphis, where it was to form a part
of an army to be sent to Chattanooga, to reenforce General
Rosecrans. I designated the First Division, and at 4 a. m. the
same day it marched for Vicksburg, and embarked the neat day.

On the 23d of September I was summoned to Vicksburg by the general
commanding, who showed me several dispatches from the general-
in-chief, which led him to suppose he would have to send me and my
whole corps to Memphis and eastward, and I was instructed to
prepare for such orders. It was explained to me that, in
consequence of the low stage of water in the Mississippi, boats had
arrived irregularly, and had brought dispatches that seemed to
conflict in their meaning, and that General John E. Smith's
division (of General McPherson's corps) had been ordered up to
Memphis, and that I should take that division and leave one of my
own in its stead, to hold the line of the Big Black. I detailed
my third division (General Tuttle) to remain and report to
Major-General McPherson, commanding the Seventeenth Corps, at
Vicksburg; and that of General John E. Smith, already started for
Memphis, was styled the Third Division, Fifteenth Corps, though it
still belongs to the Seventeenth Army Corps. This division is also
composed of three brigades, commanded by General Matthias, Colonel
J. B. Raum (of the Fifty-sixth Illinois), and Colonel J. I.
Alexander (of the Fifty-ninth Indiana).

The Second and Fourth Divisions were started for Vicksburg the
moment I was notified that boats were in readiness, and on the
27th of September I embarked in person in the steamer Atlantic,
for Memphis, followed by a fleet of boats conveying these
two divisions. Our progress was slow, on account of the
unprecedentedly low water in the Mississippi, and the scarcity of
coal and wood. We were compelled at places to gather fence-rails,
and to land wagons and haul wood from the interior to the boats;
but I reached Memphis during the night of the 2d of October, and
the ot