The military had commenced a move to accomplish a certain purpose under the lead of the sheriff, and as his posse; a collision had occurred, the sheriff had left, the mayor refused to cooperate with the sheriff or military, and it was the duty of the military officers to carry out the movement, (to wit: dispersing the mob,) in a vigorous manner, and not in any way be swayed from their duty by the sentiment above spoken of. We think the order given by General Latta, sent by Sergeant Wilson to General Brinton in the round house, which closed as follows, viz: "If compelled to escape at last, do so to the eastward; take Penn avenue if possible, and make for Guthrie, at Torrens," was a mistake. Some question has arisen as to the right of General Latta to give orders to General Brinton at all. We think that it is enough to say that General Latta was directed by the commander-in-chief to "go to Pittsburgh and keep supervision of all troops ordered out;" that he went there in pursuance of these directions, issued orders as if he understood himself to be at the head of military affairs after General Pearson left, was so recognized by all, and his orders obeyed as if coming from the commander-in-chief, and that, therefore, he cannot escape the responsibility of any orders issued by him, or the failure to take such steps as a military commander should have taken under the circumstances. If General Brinton was to leave the round house he should have been ordered to the Union depot, where he could have fed his men, and received a supply of ammunition, and from there he could have taken the most available position to disperse the mob and protect property. Of General Brinton's ability to have made this movement, if so ordered at any time, there can be no doubt. Life would probably have been sacrificed in making such a move, but law and order must be upheld, even at the sacrifice of the lives of such persons as composed that lawless mob, or those who innocently mingled with it. The loss of life on the part of the troops could not have been greater than it was by pursuing the course afterwards taken, and it probably would have been much less, as mobs are always cowardly, and every demonstration made against this mob after the collision at Twenty-eighth street by any persons having authority, either civil or military, scattered it. Colonel Guthrie, with the Eighteenth regiment, should have been ordered from Torrens to Pittsburgh Saturday night, and the only excuse we can conceive for not doing this promptly, without waiting for the troops from Walls Station, is the fear that being Pittsburgh men they would refuse to obey any orders which would bring them in collision with the mob. This is not sufficient excuse. The proper order should have been given, as this regiment had not shown any insubordination, was not allowed to mix or talk with the mob, and would no doubt have obeyed all orders.