started which was exploded on the 1st of July, destroying
an entire rebel redan, killing and wounding a considerable number of its
occupants and leaving an immense chasm where it stood. No attempt to
charge was made this time, the experience of the 25th admonishing us.
Our loss in the first affair was about thirty killed and wounded. The
enemy must have lost more in the two explosions than we did in the
first. We lost none in the second.

From this time forward the work of mining and pushing our position
nearer to the enemy was prosecuted with vigor, and I determined to
explode no more mines until we were ready to explode a number at
different points and assault immediately after. We were up now at three
different points, one in front of each corps, to where only the parapet
of the enemy divided us.

At this time an intercepted dispatch from Johnston to Pemberton informed
me that Johnston intended to make a determined attack upon us in order
to relieve the garrison at Vicksburg. I knew the garrison would make no
formidable effort to relieve itself. The picket lines were so close to
each other--where there was space enough between the lines to post
pickets--that the men could converse. On the 21st of June I was
informed, through this means, that Pemberton was preparing to escape, by
crossing to the Louisiana side under cover of night; that he had
employed workmen in making boats for that purpose; that the men had been
canvassed to ascertain if they would make an assault on the "Yankees" to
cut their way out; that they had refused, and almost mutinied, because
their commander would not surrender and relieve their sufferings, and
had only been pacified by the assurance that boats enough would be
finished in a week to carry them all over. The rebel pickets also said
that houses in the city had been pulled down to get material to build
these boats with. Afterwards this story was verified: on entering the
city we found a large number of very rudely constructed boats.

All necessary steps were at once taken to render such an attempt
abortive. Our pickets were doubled; Admiral Porter was notified, so
that the river might be more closely watched; material was collected on
the west bank of the river to be set on fire and light up the river if
the attempt was made; and batteries were established along the levee
crossing the peninsula on the Louisiana side. Had the attempt been made
the garrison of Vicksburg would ha