after the explosion in front of the Eighteenth Corps on our right, the enemy shelled our line vigorously for about half an hour, causing some casualties. Some of the pickets of the right of our line ran in at the time of the explosion, but the line was immediately re-established. An officer of the Third Maryland Volunteers reports, from his own observation, that the advanced sap driven by the Eighteenth Corps, near the enemy's works, was blown up by the enemy. Our men had notice of the explosion in time to save themselves, very few being injured.

I remain, colonel, very respectfully, your obedient servant,

J. WHITE,

Brigadier-General, Commanding Division.

HEADQUARTERS SECOND DIVISION, NINTH ARMY CORPS,
Before Petersburg, Va., August 5, 1864.

Lieutenant Colonel LEWIS RICHMOND,

Assistant Adjutant-General, Ninth Army Corps:

COLONEL: I have the honor to report that nothing of importance occurred on my front in the past twelve hours. Work is continued on the defenses, and the abatis is nearly completed. A detail of 500 men has been at work since 7 o'clock last evening on Fort Morton.

I am, colonel, very respectfully, your obedient servant,

ROBERT B. POTTER,

Brigadier-General, Commanding.

HEADQUARTERS SECOND DIVISION, NINTH ARMY CORPS,
Before Petersburg, Va., August 5, 1864.

Lieutenant Colonel LEWIS RICHMOND,

Assistant Adjutant-General, Ninth Army Corps:

COLONEL: I have the honor to report that there has been no movement on our front in the last twelve hours, and almost entire quiet has prevailed. The cannonading of the enemy in front of the Eighteenth Corps extended partially to our front, where, however, there was but little firing.

I am, colonel, very respectfully, your obedient servant,

ROBERT B. POTTER,

Brigadier-General, Commanding.

HEADQUARTERS CAVALRY CORPS,
August 5, 1864.

Colonel J. IRVIN GREGG,

Commanding Second Division, Cavalry Corps:

COLONEL: The general commanding directs that you dispose the brigades and regiments of the Second Division, as follows: Four regiments of one brigade, not less that 1,200 men, on the left of the army, the picket-line of this force to connect with the left of our infantry and extend around to the plank road, as ow established; patrols will also be sent from this force from McCann's to the Lee's Mill road, and the road connecting these points will be picketed for some distance, as also the plank road to the point where the picket-line strikes it. One regiment of the brigade will be posted in front of McCann's, on the Norfolk railroad.