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88 toward the Susquehanna, I hope has reached you ere this. After dispatching my letter, learning that the enemy had not renewed his attempts of yesterday, to break through the Blue Ridge, I directed General R. H. Anderson's division to commence its march towards Shepherdstown. It will rest there tomorrow. I also directed General Stuart, should the enemy have so far retired from his front to permit of the departure of a portion of the cavalry, to march with three brigades across the Potomac, and place himself on your right, and in communication with you, keep you advised of the movements of the enemy and assist in collecting supplies for the army. I have not heard from him since. I also directed General Imboden, if opportunity, offered, to cross the Potomac and perform the same offices on your left," &c. * * *

The letter to Stuart, written the same day, is as follows: "General: I have just received your note of 7:45 this morning to General Longstreet. I judge the efforts of the enemy yesterday were to arrest our progress, and ascertain our whereabouts. Perhaps he is satisfied. Do you know where he is, and what he is doing? I fear he will steal a march on us, and get across the Potomac before we are aware. If you find that he is moving northward, and that two brigades can guard the Blue Ridge and take care of your rear, you can move with the other three into Maryland, and take position on General Swell's right; place yourself in communication with him, guard his flank, keep him informed of the enemy's movements, and collect all the supplies you can for the use of the army. One column of General Ewell's army will probably move toward the Susquehanna by the Emmittsburg route; another by Chambersburg. Accounts from him last night state there was no enemy west of Frederick," &c.

It is quite plain from this letter, that Stuart's taking his three brigades into Maryland and putting himself on Ewell's right, was, in case he found the enemy moving northward, and that the two remaining brigades could guard the Blue Ridge and take care of the rear; and it would also appear that the instructions contemplated that if such a move were made, Stuart would be able immediately to put himself in touch with Ewell, and be able