I first began, in my own name, to give them a pretty exact account of the situation we were in three months ago, of the supernatural efforts which the country had made for the purpose of an immediate co-operation. I told them that by the 1st of January our army would be dismissed; that the Militia was only to serve for three months. I added, that for the defensive they were useless to us, nay, they were hurtful, and that I thought it necessary to take New-York before the winter. All that, my dear General, was said in my own name, and therefore in a less delicate way than when I am your interpreter.

I then told them that I was going to speak of you, and after many compliments, assurances of confidence, &c., I went on with your plan, beginning with the importance of possessing the harbour, and going on about the three ways which you have directed me to point out as to be hereafter regulated by circumstances.

As to the possessing of the harbour the Chevalier told that he did not believe his ships might go in; but that if superior at sea, he would answer by cruising off to protect the landing, the transportation, and prevent an evacuation; indeed to blockade the harbour.

The French General, with the advice of the Naval commander did not hesitate to prefer the going in transports to the point you know of. Both were of opinion that nothing could be undertaken unless we had a naval superiority, and as I know it is your opinion also, (tho' it is not mine,) I durst not insist on that article.

There was another reason which made me wait for the reinforcement. I knew we had neither arms nor powder. I know we would be at least a long time to get them; but as they did not think of making me the objection I put my assent to the others on the account of my private confidence in their superior abilities; told them that you also thought we should have a naval superiority, and added, in my own name, that however we must, any how, act before the winter, and get rid of a shameful defensive.

The summary of the arrangement will, I presume, be this: That as soon as we hear of a naval reinforcement we go where you know, and establish what you intend to fix; that, if possible, we get where I want you to be; that immediately the French will embark and go where you wish them to be, or thereabout; that a number equal to the enemy's whole force be stationed in that part; that they don't want there more than ten pieces of our heavy cannon; that after every thing will be disembarked, three weeks, in their opinion, will do the business on their side; that proper means will be taken by sea to keep up the communication and prevent an evacuation; that we must not give up that plan if we may begin in August or September; that fascines and other apparatus must be ready on the opposite shore; that they will take for us all the boats belonging to the Continent which will be at Providence; that as soon as our clothing, &c., arrive, it will without entering any harbour be sent to W.C. or thereabout.

Their superiority at sea, will, I think, take place in the course of this month; they have two ways to depend upon it:—1st, Unless of an absolute impossibility the second division, consisting of four other regiments and the remaining part of Lauzun's, with the Alliance and all other stores, and with a strong convoy of ships of the line, will be here very soon. When they will be heard of on the coast, Chevalier de Tergay will, at all events, go out and meet them. 2dly, the Gentleman I wrote to on my arrival has full liberty to send here reinforcements, the Admiral has already applied to him, but I am going to make him write other letters in my way, and will send them to-morrow or the day after to Chevalier de la Luzerne, whom I beg you will immediately desire to secure three fast sailing vessels for the West Indies.

I am going this evening to fix plans with Pilots, and also to speak of the entrance of the harbour. Dobs and Shaw are here, and I will have a full conversation with them and the Admiral, both for the entrance of the harbour and the navigation of the Sound. To-morrow I call, with as much secrecy as possible, a number of Pilots for the harbour of Halifax and River St. Laurence.

Inclosed, you will find a letter from Count de Rochambeau. He requests you will have the goodness of letting the Minister know what the French army is about, as he had no time of writing to him; it is, I believe, very important. 1st, To send every where to meet the reinforcement, and give them proper directions. 2dly, To have some vessels ready for the West Indies.

The French set more value upon Rhode Island than it is worth. I however got them to promise that in case of an operation they will not leave here a Garrison, and that their Magazines would be sent to Providence.