This development rendered useless any further effort on Hancock’s part or mine to carry out the plan of the expedition, for General Grant did not intend Hancock to assault the enemy’s works unless there should be found in them but a very thin line of infantry which could be surprised.  In such event, Hancock was to operate so that the cavalry might turn the Confederates on the Central or Charles City road, but the continually increasing force of the enemy showed this to be impracticable.  The long front presented by Hancock’s corps and the cavalry deceived General Lee, and he undoubtedly thought that nearly all of Grant’s army had been moved to the north side of the James River; and to meet the danger he transferred the most of his own strength to the same side to confront his adversary, thinning the lines around Petersburg to reinforce those opposing us on the Central and New Market roads.  This was what Grant hoped Lee would do in case the operations of Hancock and myself became impracticable, for Grant had an alternative plan for carrying Petersburg by assault in conjunction with the explosion of a mine that had been driven under the enemy’s works from the front of Burnside’s corps.

Now that there was no longer a chance for the cavalry to turn the enemy’s left, our attention was directed to keeping up the deception of Lee, and on the afternoon of the 28th Hancock’s corps withdrew to a line nearer the head of the bridge, the cavalry drawing back to a position on his right.  From now on, all sorts of devices and stratagems were practiced—­anything that would tend to make the Confederates believe we were being reinforced, while Hancock was preparing for a rapid return to Petersburg at the proper time.  In order to delude the enemy still more after night-fall of the 28th I sent one of my divisions to the south side of the James, first covering the bridgeway with refuse hay to keep the tramp of the horses from being heard.  After daylight the next morning, I marched this division back again on foot, in full view of the enemy, to create the impression of a continuous movement large bodies of infantry to the north side, while the same time Kautz was made to skirmish with the enemy on our extreme right.  These various artifices had the effect intended, for by the evening of the 29th Lee had transferred all his infantry to the north bank of the James, except three divisions, and all his cavalry save one.

The morning of the 30th had been fixed upon to explode the mine and assault the enemy’s works, so after dark on the evening of the 29th Hancock hastily but quietly withdrew his corps to the south side to take part in the engagement which was to succeed the explosion, and I was directed to follow Hancock.  This left me on the north side of the river confronting two-thirds of Lee’s army in a perilous position, where I could easily be driven into Curl’s Neck and my whole command annihilated.  The situation, therefore, was not a pleasant one to contemplate,