by ordinary casualties, but
also by having to detach troops to hold its constantly extending line
over which to draw supplies, while the enemy in front was as constantly
being strengthened. Mobile was important to the enemy, and in the
absence of a threatening force was guarded by little else than
artillery. If threatened by land and from the water at the same time
the prize would fall easily, or troops would have to be sent to its
defence. Those troops would necessarily come from Bragg. My judgment
was overruled, and the troops under my command were dissipated over
other parts of the country where it was thought they could render the
most service.

Soon it was discovered in Washington that Rosecrans was in trouble and
required assistance. The emergency was now too immediate to allow us to
give this assistance by making an attack in rear of Bragg upon Mobile.
It was therefore necessary to reinforce directly, and troops were sent
from every available point.

Rosecrans had very skilfully manoeuvred Bragg south of the Tennessee
River, and through and beyond Chattanooga. If he had stopped and
intrenched, and made himself strong there, all would have been right and
the mistake of not moving earlier partially compensated. But he pushed
on, with his forces very much scattered, until Bragg's troops from
Mississippi began to join him. Then Bragg took the initiative.
Rosecrans had to fall back in turn, and was able to get his army
together at Chickamauga, some miles south-east of Chattanooga, before
the main battle was brought on. The battle was fought on the 19th and
20th of September, and Rosecrans was badly defeated, with a heavy loss
in artillery and some sixteen thousand men killed, wounded and captured.
The corps under Major-General George H. Thomas stood its ground, while
Rosecrans, with Crittenden and McCook, returned to Chattanooga. Thomas
returned also, but later, and with his troops in good order. Bragg
followed and took possession of Missionary Ridge, overlooking
Chattanooga. He also occupied Lookout Mountain, west of the town, which
Rosecrans had abandoned, and with it his control of the river and the
river road as far back as Bridgeport. The National troops were now
strongly intrenched in Chattanooga Valley, with the Tennessee River
behind them and the enemy occupying commanding heights to the east and
west, with a strong line across the valley from mountain to mountain,
and with Chattanooga Creek, for