Cadwalader, June 28, 1861—8 p. m

COLONEL: I have just received the inclosed letter from General Negley, saying that he is informed the enemy are preparing to cross the river at Harper’s Ferry. I have no reason for doubting the fact, other than I think their main force is near Bunker Hill, say 7,000 or 8,000 men, and the remainder, with perhaps the greater part of the artillery and cavalry, south of Falling Waters, say perhaps 5,000 men. The artillery, said to be seventeen 6-pounders, are rifled brass pieces, as is said by an intelligent deserter here and confirmed by one other source. I have written to General Negley to say I will support him at once on hearing that the enemy have actually crossed the river.

Very respectfully, your obedient servant,