Major General Hooker: June 16, 1863.
Your despatches of last night and this morning are just received. I shall have General Halleck to answer them carefully. Meanwhile, I can only say that, as I understand, Heintzelman commands here in this District; that what troops, or very nearly what number, are at Harper's Ferry I do not know, though I do know that Tyler is in command there. Your idea to send your cavalry to this side of the river may be right---probably is; still, it pains me a little that it looks like defensive merely, and seems to abandon the fair chance now presented of breaking the enemy's long and necessarily slim line, stretched now from the Rappahannock to Pennsylvania. A. LINCOLN.