HEADQUARTERS ARMIES IN THE FIELD,

Colonel Comstock, who will take this, can spend a day with you, and fill up many little gaps of information not given in any of my letters.

What I now want more particularly to say is, that if the two main attacks, yours and the one from here, should promise great success, the enemy may, in a fit of desperation, abandon one part of their line of defense, and throw their whole strength upon the other, believing a single defeat without any victory to sustain them better than a defeat all along their line, and hoping too, at the same time, that the army, meeting with no resistance, will rest perfectly satisfied with their laurels, having penetrated to a given point south, thereby enabling them to throw their force first upon one and then on the other.

With the majority of military commanders they might do this.

But you have had too much experience in traveling light, and subsisting upon the country, to be caught by any such ruse. I hope experience has not been thrown away. My directions, then, would be, if the enemy in your front show signs of joining Lee, follow him up to the full extent of your ability. I will prevent the concentration of Lee upon your front, if it is in the power of his army to do it.

The Army of the Potomac looks well, and, so far as I can judge, officers and men feel well. Yours truly,