SIR,--I was honored, yesterday with your Excellency's favor enclosing the resolutions of Congress of the 8th instant, for removing stores and provisions from the counties of Accomack and Northampton. We have there no military stores, except a few muskets in the hands of the militia. There are some collections of forage and provisions belonging to the Continent, and some to the State, and the country there, generally, furnishes an abundance of forage. But such is the present condition of Chesapeake Bay that we cannot even get an advice boat across it with any certainty, much less adventure on transportation. Should, however, any interval happen, in which these articles may be withdrawn, we shall certainly avail ourselves of it, and bring thence whatever we can. If I have been rightly informed, the horses there are by no means such, as that the enemy could apply them to the purposes of cavalry. Some large enough for the draught may, perhaps, be found, but of these not many. I have the honor to be, with the greatest respect, your Excellency's most obedient and most humble servant. TO HIS EXCELLENCY GENERAL WASHINGTON. RICHMOND, April 23, 1781. SIR,--On the 18th instant, the enemy came from Portsmouth up James river, in considerable force, though their numbers are not yet precisely known to us. They landed at Burwell's ferry, below Williamsburg, and also a short distance above the mouth of Chickahomony. This latter circumstance obliged Colonel Innis, who commanded a body of militia, stationed on that side the river to cover the country from depredation, to retire upwards, lest he should be placed between their two bodies. One of these entered Williamsburg on the 20th, and the other proceeded to a ship-yard we had on Chickahomony. What injury they did there, I am not yet informed. I take for granted, they have burned an unfinished twenty-gun ship we had there. Such of the stores, belonging to the yard as were movable, had been carried some miles higher up the river. Two small gallies also retired up the river. Whether by this, either the stores or gallies were saved, is yet unknown. I am just informed, from a private hand, that they left Williamsburg early yesterday morning. If this sudden departure was not in consequence of some circumstance of alarm unknown to us, their expedition to Williamsburg has been unaccountable. There were no public stores at that place, but those which were necessary for the daily subsistence of the men there. Where they mean to descend next, the event alone can determine. Besides harassing our militia with this kind of war, the taking them from their farms at the interesting season of planting their corn, will have an unfortunate effect on the crop of the ensuing year. I have heard nothing certain of General Greene since the 6th instant, except that his head-quarters were on Little river on the 11th.