James Blaine: “The knowledge of the situation had penetrated the ranks, and the men lost spirit and hope.”

And if Congress shall break up the present Union by unconstitutionally putting strife and enmity and armed hostility between different sections of the country, instead of the domestic tranquility which the Constitution was meant to insure…

Without the exercise of those functions which belong exclusively to the civil service, the laws cannot be executed in any event, no matter what may be the physical strength which the Government has at its command.

Is any portion of the people bound to contribute their money or their blood to carry on a contest like that?

You can use force only to repel an assault on the public property and aid the Courts in the performance of their duty.