force of 271, or else I cannot understand why they made no pursuit nor came out, as we could discover, from the rise of ground behind which they were posted with their overwhelming numbers.

The enemy's whole force left Vienna last night between 10 and 12 o'clock; supposed to have gone to Fairfax Court-House. It is understood that there is a considerable force assembled at that point, but cannot ascertain how many. None of the bridges have been burned, not the railway with, between this point and Vienna since we came down the road.

I send this, as we remain at this point without other facilities for correspondence or writing except to communicate by the Army telegraph, and I trust you will accept it in place of a formal written report.

I am, just now ordered by Brigadier-General Tyler to move forward with my brigade in the direction of Falls Church, for which I am now getting in readiness. I have already spoken of the skill and coolness with which Colonel McCook and Major Hughes, with other officers, helped to conduct our retirement to this place. It was a very slow and painful march, carrying in the arms of the men and in blankets and on rude litters made by the way their wounded comrades. But I must not omit to mention others.

Adjt. J. S. Parrott, my aide, Lieutenant Raynor, and Surgeon McMallen gave effective assistance. The company officers who were under fire generally behaved with coolness and gallantry. Captain Pease of Company C, especially distinguished himself in protecting our rear and flanks, and I warmly recommend him to favorable consideration. The non-commissioned officers and men generally also behaved extremely well on the march, as we retired along the road. Captain Crowe, with Company D, which was among those I had left as patrol guards on the railway as we passed up, came up handsomely at double-quick step to our support,and Lieutenant Colonel E. A. Parrott, with his detachment of two companies, which had been thrown out to Falls Church and on the roads in that neighborhood, hearing of the attack on our advance, hastened by a cross-road to the line of the railroad to join and give us any support required.

I have, in my former dispatch, mentioned the disregard of my instructions and cowardly desertion of us by the engineer of the train. His name, I understand, is Gregg. One of the brakemen, Dormin, joined us, and carried a musket and gave good help. The enemy, I learn, burned that part of the train which was abandoned by the engineer.

ROBT. C. SCHENCK,

Brigadier-General.

Numbers 3. Report of Colonel Maxcy Gregg, First South Carolina Infantry.

CAMP NEAR FAIRFAX COURT-HOUSE,

June 18, 1861-1.30 a.m.

COLONEL: In pursuance of orders received at 1 o'clock a.m. on the 16th of June, I proceeded in the forenoon of that day to make a reconnaissance across the country towards the Potomac. Marching from this place with my regiment (about five hundred and seventy-five strong), after leaving a large camp guard and Captain Ball's troop of horse, numbering about seventy, including a detachment from Captain Wickham's troop, I met at the Frying-pan Church Captain Terry's troop of horse,