From the Richmond Enquirer, July 20.

An officer of Bragg’s army stated to us when he heard of Pope’s transfer to Virginia to command the Yankee forces in the Piedmont and Potomac regions, that he was a very bold and audacious commander, and would surprise us by unexpected enterprises, unless we were very vigilant. But he also said that his plans were not well conceived or judicious, and that he would expose himself to heavy chastisement and disaster if our opposing General should be on the alert.

To the Newspapers of Richmond.—We understand that the Confederate Surgeons at the camp of the conscripts near this City, are in the habit of charging a fee of ten dollars…

Our advices from Gordonsville yesterday represent that everything continued quiet, the enemy having made no further demonstration above Richmond since his harmless dash upon the Central Railroad on Wednesday last.…

Headquarters Army Potomac, July 18.—A flag of truce went up yesterday from Turkey Island Creek, having on board Gen. Dix, who went to meet Gen. Hill for the purpose of making a permanent arrangement for an exchange of prisoners. The interview was highly satisfactory, but no conclusion being arrived at, the flag of truce will return to-day, when Gen. Lee will be present. Richmond papers of to-day contain accounts of the death of Gen. Twiggs at Augusta, .July 15th.

GREAT SENSATION AMONG THE SECESH.

New York, July 18.—The New York Tribunes Washington dispatch states: We have advices from Warrenton to-day. The news has been received that Gen. Hatch occupied Gordonsville. This has created great consternation among the leading rebels in Warrenton, who had not the least idea that Gen. Pope would reach that point without a great battle. Index, many of them said, would be held at all hazards, and that no Yankee army would be allowed to take it.

There is but little room longer to doubt that McClellan has effected his escape to James River with the remainder of his force, amounting to about 75,000 men, with a portion of his cannon and stores. It appears also that he has been re-inforced strongly, making his army about 100,000 men.

He is entrenching on the river at the confluence of the Chickahominy and James rivers, under cover of the gunboats. His position is a very strong one. It was expected that he would be attacked on Saturday last, as the divisions of Jackson, Longstreet and A. P. Hill were near him. But no attack has yet been made, nor does it appear that ordinary prudence would allow an attack under such circumstances. Having failed to cut off his retreat, when according to rumor he was entirely in our power, and when every attack upon his batteries was attended with severe loss, it could hardly be the part of wisdom to attack him in his present position, when so little can be gained at the risk of so great loss.

Subsequent Release of the Prisoners.

Martinsburg, July 1—12.35.—Col. Harness, formerly of Ashby’s cavalry, captured Moorfield on Sunday afternoon, and about one hundred of the Maryland Home Guard who held the place were all taken prisoners.

Luray, Va., June 30.—Gen. Crawford, with a portion of his brigade, and cavalry under Col. Tompkins, made a reconnoissance in force up the valley and entered the town this morning,…

The wife of Gen. Robert E. Lee, who has been for some time past under guard in the house where she was found upon the arrival of the Federal troops,…