w was necessary. The only further precaution which
he could have taken, and which he could not foresee, would have been to
have different men to execute them.

The gallery to the mine was over five hundred feet long from where it
entered the ground to the point where it was under the enemy's works,
and with a cross gallery of something over eighty feet running under
their lines. Eight chambers had been left, requiring a ton of powder
each to charge them. All was ready by the time I had prescribed; and on
the 29th Hancock and Sheridan were brought back near the James River
with their troops. Under cover of night they started to recross the
bridge at Deep Bottom, and to march directly for that part of our lines
in front of the mine.

Warren was to hold his line of intrenchments with a sufficient number of
men and concentrate the balance on the right next to Burnside's corps,
while Ord, now commanding the 18th corps, temporarily under Meade, was
to form in the rear of Burnside to support him when he went in. All
were to clear off the parapets and the _abatis_ in their front so as to
leave the space as open as possible, and be able to charge the moment
the mine had been sprung and Burnside had taken possession. Burnside's
corps was not to stop in the crater at all but push on to the top of the
hill, supported on the right and left by Ord's and Warren's corps.

Warren and Ord fulfilled their instructions perfectly so far as making
ready was concerned. Burnside seemed to have paid no attention whatever
to the instructions, and left all the obstruction in his own front for
his troops to get over in the best way they could. The four divisions
of his corps were commanded by Generals Potter, Willcox, Ledlie and
Ferrero. The last was a colored division; and Burnside selected it to
make the assault. Meade interfered with this. Burnside then took
Ledlie's division--a worse selection than the first could have been. In
fact, Potter and Willcox were the only division commanders Burnside had
who were equal to the occasion. Ledlie besides being otherwise
inefficient, proved also to possess disqualification less common among
soldiers.

There was some delay about the explosion of the mine so that it did not
go off until about five o'clock in the morning. When it did explode it
was very successful, making a crater twenty feet deep and something like
a hundred feet in length. Instantly one hundred and ten cannon and
fifty