siege-guns; F, flag-staff; H, draw-bridge; K, well; M, magazine; 0, Ordnance stores; P, Adjutant's quarters; Q, Headquarters; R, officers' quarters.
General Halleck, as we have seen, had divided his large Department into military districts, and he had given the command over that of Cairo to General Grant.
This was enlarged late in December,
Dec. 20, 1861. so as to include all of Southern Illinois, Kentucky west of the Cumberland River, and the counties of Eastern Missouri south of Cape Girardeau.
Grant was therefore commander of all the land forces to be engaged in the expedition against Fort Henry.
The number of troops — officers and men — under General Grant's command, who were fit for duty at the middle of January, 1862, was 24,608. To that end he collected his troops at the close of the reconnaissance just mentioned, chiefly at Cairo and Paducah, and had directed General Smith to gain what information he could concerning the two Tennessee forts.
Accordingly, on his retu