(ORIGINAL.)

Allen's Creek, 22 miles from Richmond, Jane 18th, 1781.

SIR,—The enemy's position at Cooke's ford enabled them either to return to James River or to gain our northern communication. The arms and other precious stores arriving from Philadelphia, the importance of a junction with Gen. Wayne, and other strong reasons mentioned in my last, made it my first object to check the further progress of Lord Cornwallis. Some stores at the forks of James River were under the care of the major general, the Baron de Steuben, who had five hundred regulars of the Virginia new levies, and some militia.

Col. Tarlton's legion having pressed for Charlottesville, where the Assembly were sitting, was disappointed in his purpose by proper information being given them. One hundred and fifty arms, however, and a small quantity of powder fell into the enemy's hands.

A detachment under Col. Simcoe said to be four hundred dragoons and mounted infantry, proceeded to the point of Fork, of which the Baron de Steuben received notice. Both his men and stores were transported to the south branch when the Baron marched to Etaunton River. Simcoe threw over a few men which destroyed what stores had been left. He hazarded a great deal, but our loss was inconsiderable.

In the meantime the British army was moving to the point of Fork, with intention to strike our magazines at Albermarle old Court House. Our force was not equal to their defence, and a delay of our junction would have answered the views of the enemy. But on the arrival of the Pennsylvanians we made forced marches towards James River, and on our gaining the South Anna we found Lord Cornwallis encamped some miles below the point of Fork. A stolen march through a difficult road gave us a position upon Michunk Creek, between the enemy and our magazines, where, agreeable to appointment, we were joined by a body of riflemen. The next day Lord Cornwallis retired towards Richmond (where he now is) and was followed by our small army.

I have directed General Steuben to return this way and a junction will be formed as soon as his distance permits.

With the highest regard, &c., &c.

P. S. The following is an extract of a letter just now received from James Barron, Commodore, dated Warwick, 9 miles from Hampton, June 17th, 1781,

"At five o'clock this afternoon anchored in the road from sea, 35 sail of the enemies' vessels; viz: 24 ships, 10 brigs and one schooner, which I take to be the fleet that sailed from hence 13 days ago. Only 4 appear to have troops on board."

TO GENERAL GREENE.