"While, therefore, you will permit no interference by the persons under your command, with the relations of Persons held to Service under the laws of any State, you will, on the other hand, so long as any State, within which your Military operations are conducted, is under the control of such armed combinations, refrain from surrendering to alleged masters any Person who may come within your lines. "You will employ such Persons in the services to which they may be best adapted, keeping an account of the labor by them performed, of the value of it, and the expenses of their maintenance. The question of their final disposition will be reserved for future determination. "SIMON CAMERON, "Secretary of War. "To Major General BUTLER." Great tenderness, however, was exhibited by many of the Union Generals for the doomed Institution. On June 3, 1861, from Chambersburg, Pa., a proclamation signed "By order of Major General Patterson, F. J. Porter, Asst. Adj. General," was issued from "Headquarters Department of Pennsylvania," "To the United States troops of this Department," in which they are admonished "that, in the coming campaign in Virginia, while it is your duty to punish Sedition, you must protect the Loyal, and, should the occasion offer, at once suppress Servile Insurrection." "General Orders No. 33," issued from "Headquarters Department of Washington," July 17, 1861, "By command of Brigadier General Mansfield, Theo. Talbot, Assistant Adjutant General," were to this effect: "Fugitive Slaves will under no pretext whatever, be permitted to reside, or be in any way harbored, in the quarters or camps of the troops serving in this Department. Neither will such Slaves be allowed to accompany troops on the march. Commanders of troops will be held responsible for a strict observance of this order." And early in August a Military order was issued at Washington "that no Negroes, without sufficient evidence of their being Free or of their right to travel, are permitted to leave the city upon the cars." But Bull Run did much to settle the Military as well as public mind in proper grooves on this subject. Besides employing Negro Slaves to aid Rebellion, by the digging of ditches, the throwing up of intrenchments, and the erection of batteries, their Rebel masters placed in their hands arms with which to shoot down Union soldiers at the Battle of Bull Run, which, as we have seen, occurred on Sunday, July 21, 1861--and resulted in a check to the Union Cause. The terror and confusion and excitement already referred to, that prevailed in Washington all that night and the next day, as the panic-stricken crowd of soldiers and civilians poured over the Long Bridge, footsore with running, faint with weariness, weak with hunger, and parched with thirst and the dust of the rout, can hardly be described.