d, marching by the flank, it would be considered "good
order" to have five thousand men to a mile, so that a full corps of
thirty thousand men would extend six miles, but with the average
trains and batteries of artillery the probabilities are that it
would draw out to ten miles. On a long and regular march the
divisions and brigades should alternate in the lead, the leading
division should be on the road by the earliest dawn, and march at
the rate of about two miles, or, at most, two and a half miles an
hour, so as to reach camp by noon. Even then the rear divisions
and trains will hardly reach camp much before night. Theoretically,
a marching column should preserve such order that by simply halting
and facing to the right or left, it would be in line of battle; but
this is rarely the case, and generally deployments are made
"forward," by conducting each brigade by the flank obliquely to the
right or left to its approximate position in line of battle, and
there deployed. In such a line of battle, a brigade of three
thousand infantry would occupy a mile of "front;" but for a strong
line of battle five-thousand men with two batteries should be
allowed to each mile, or a division would habitually constitute a
double line with skirmishers and a reserve on a mile of "front."

The "feeding" of an army is a matter of the most vital importance,
and demands the earliest attention of the general intrusted with a
campaign. To be strong, healthy, and capable of the largest
measure of physical effort, the soldier needs about three pounds
gross of food per day, and the horse or mule about twenty pounds.
When a general first estimates the quantity of food and forage
needed for an army of fifty or one hundred thousand men, he is apt
to be dismayed, and here a good staff is indispensable, though the
general cannot throw off on them the responsibility. He must give
the subject his personal attention, for the army reposes in him
alone, and should never doubt the fact that their existence
overrides in importance all other considerations. Once satisfied
of this, and that all has been done that can be, the soldiers are
always willing to bear the largest measure of privation. Probably
no army ever had a more varied experience in this regard than the
one I commanded in 1864'65.

Our base of supply was at Nashville, supplied by railways and the
Cumberland River, thence by rail to Chattanooga, a "secondary
base," and thence forward a