In addition to this, there were advanced intrenchments which had to be taken before a close siege could be commenced.
Sure enough, as indicated by the change of commanders, the enemy was about to assume the offensive.

On the 20th he came out and attacked the Army of the Cumberland most furiously.

Hooker's corps, and Newton's and Johnson's divisions were the principal ones engaged in this contest, which lasted more than an hour; but the Confederates were then forced to fall back inside their main lines.

The losses were quite heavy on both sides.

On this day General Gresham, since our Postmaster-General, was very badly wounded.