(ORIGINAL.)

York, March 15th, 1781.

My Dear General,—The number of small frigates and privateers that are in the bay, made it impossible for me to carry the detachment farther down than Annapolis, and I have requested the Governor of Maryland as well as the principal officers of the detachment, to give out that we are going to join General Greene; but the object of the expedition is so perfectly well known every where, that our sole dependence to keep Arnold must be upon the apprehension he has of a French fleet being cruizing off the capes.

For my part, I came in a barge from Annapolis, and very luckily escaped the dangers that were in the way. Colonel Harrison will have given to your Excellency a minute detail of the reasons which have prompted me to this measure. I have taken his advice on the matter, and have no doubt but that your Excellency (considering the probability that no frigate would have been sent) will approve of the step I have taken to forward as much as possible both the advantage of the expedition and the honor of the American arms.

On my arrival, (yesterday afternoon) I have found that Baron de Stuben had been very active in making preparations, and agreeable to what he tells me, we shall have five thousand militia ready to operate. This, with the Continental detachment, is equal to the business, and we might very well do without any land force from Newport.

By papers found in the baggage of a British officer, (taken in a boat) it seems that General Gregory had a correspondence with the enemy. The Baron has suspended him, but he is still with the troops.

Arnold is so well acquainted with the coming of the detachment, and his object is so well known, that, as I said before, our only chance to keep him must be the idea of a French fleet being off the capes; he is fortifying at Portsmouth, and trying to get provisions. There has been some trifling skirmishes with the militia.

To my great disappointment the French fleet have not yet appeared. If the project has not been given up they must be expected every minute; they had double the time which they wanted, and such winds as ought have brought them in four days.

I wanted to hold up the idea of my going to the Southward; but the Baron says that if the detachment is not announced, the militia will desert. He wanted me to take the command immediately, but I thought it more polite not to do it until the detachment arrives or operations are begun.

In your first letter to the Baron, I wish my dear General, you will write to him that I have been much satisfied with his preparations. I want to please him, and harmony shall be my first object. As in all cases, (even this of my going to the Southward and coming here to make arrangements with the Baron) I would reconnoitre the enemies; I will take an opportunity of doing it as soon as possible. They have not as yet been reconnoitred by the Baron, and I think it therefore more necessary for me to see with my own eyes.

As I have just arrived, my dear General, I cannot give you a very exact account of matters.

This letter I send by duplicate, and have the honor to be with the highest respect and most tender affection, yours, &c.