The signal officer upon the station near Fifth Corps headquarters reports:

Parties of enemy still at work shoveling on line of entrenchments to left and rear of Gregory's house.

LYON,

Lieutenant.

By order:

Very respectfully, your obedient servant,

WM. S. STRYKER,

First Lieutenant and Adjutant of Signal Corps.

HEADQUARTERS ARMY OF THE POTOMAC, July 11, 1864.

Major General A. A. HUMPHREYS,
Chief of Staff:

GENERAL: The following report from the plank road station:

This p.m. discovered the enemy engaged on a new work about one mile and a quarter due north from station on the distant edge of the plain in rear of Gregory's house. The work is curved, with two faces fronting east and south, and seemed to be of considerable strength. It is built with embrasures, and is about a quarter of a mile in length. The enemy have also been at work sine noon on their second lines west of plank road.

J. B. DUFF,

Signal Officer.

I have the honor, general, to be, very respectfully, your obedient servant,

B. F. FISHER,

Captain and Chief of Signal Officer.

JULY 11, 1864.

Captain FISHER:

A huge column of dense smoke rising for the past hour in front of Ninth Corps, south-southwest from here, now disappearing. A few men seen in works at Farley's. Some of them have blue pants. Horseman, ambulances, and wagons passing to and for on the Richmond and Petersburg road.

Rebel messages:

L. H. B.:

Are your going this p.m.; if so, what times H. be ready? Answer.

ROUS.

8.15 A. M.

Colonel BRENT,

Assistant Adjutant-General:

One gun-boat above and one below the pontoon.

(Same to A. B.)

W. S. L.

Colonel BRENT:

All quiet this a.m.

W. S. L.

The station that received the messages to Colonel Brent is at a point southwest from here, and near the Richmond and Petersburg road.

CHAS. L. DAVIS,

Captain,&c.