Unknown to George H. Tuomas, U.s. A, June 7, 1861

Col. GEORGE H. Tuomas, U.S. A., Second Cavalry, Comdg. First Brigade, Greencastle, Pa.: COLONEL: The commanding general does not wish to make any movement forward tending to permanent occupation till he is prepared with all his force to sustain the advance. He wishes every precaution taken against precipitate action and nursing ill-feeling, both by political discussions and improper conduct of the men. The Army must have no enemies in the rear. On your prudence and judgment he relies to maintain the present status. Appeals may be made to cross into Virginia to protect Union people under assurance that a small force only is required to present itself for disunion to hide its head and loyal people to flock to your banners. They must not be heeded. If, however, inroads are made into Maryland within your reach, the commanding general desires you to meet the invaders with a force which will ride down all opposition, and in all cases to return to your present camp. When practicable, the surprise of armed parties will be effected. Brigadier-General Williams will be immediately in your rear, and is directed to sustain you in all cases.

Tam, &e., F. J. PORTER,