David D. Porter, Mississippi Squadron, General Letters (Press). O. R. (Navy), I, xxiv, 234.
Head Quarters, Dept. of the Ten
Before Vicksburg, Jan. 31st 1863.
MAJ. GEN. J. A. MCCLERNAND
COMD. G 13TH ARMY CORPS.
The intention of Gen. Orders No 13 is that I will take direct command of the Miss. river expedition which necessarily limits your command to the 13th Army Corps.
In charging the 13th Army Corps with Garrisoning the West bank of the river I add to it all the forces belonging to my command on that bank not already assigned to other Corps, and instead of weakening your force in the field it will strengthen it by about 7000 men, still leaving a proper garrison at Helena the only place I now deem necessary to garrison.
All forces, and posts garrisoned by the 13th Army Corps, are under your command subject of course to directions from these Head Quarters.
I regard the President as the Commander-in-Chief of the Army and will obey every order of his, but as yet I have seen no order to prevent my taking immediate command in the field, and since the dispatch refered to in your note I have received another from the Gen. in-Chief of the Army authorizing me directly to take command of this Army.
I at first thought I would publish no order taking command but soon saw that it would be much more convenient to issue orders direct to Corps Comdrs, whilst present with the Command, than through another commander.
your obt. svt.
U. S. GRANT
Maj. Gen. Com