WAR DEPARTMENT, January 10, 1861.

Maj. ROBERT ANDERSON,
         First Artillery, Commanding at Fort Sumter, S.C.:

SIR: Your dispatches to No. 16, inclusive, have been received. Before the receipt of that of 31st December, announcing that the Government might re-enforce you at its leisure, and that you regarded yourself safe in your present position, some two hundred and fifty instructed recruits had been ordered to proceed from Governor's Island to Fort Sumter on the Star of the West, for the purpose of strengthening the force under your command. The probability is, from the current rumors of to-day, that this vessel has been fired into by the South Carolinians, and has not been able to reach you. To meet all contingencies, the Brooklyn has been dispatched, with instructions not to cross the bar at the harbor of Charleston, but to afford to the Star of the West and those on board all the assistance they may need, and in the event the recruits have not effected a landing at Fort Sumter they will return to Fort Monroe.

I avail myself of the occasion to express the great satisfaction of the Government at the forbearance, discretion, and firmness with which you have acted, amid the perplexing and difficult circumstances in which you have been placed. You will continue, as heretofore, to act strictly on the defensive; to avoid, by all means compatible with the safety of your command, a collision with the hostile forces by which you are surrounded. But for the movement, so promptly and brilliantly executed, by which you transferred your forces to Fort Sumter, the probability is that ere this the defenselessness of your position would have invited an attack, which, there is reason to believe, was contemplated, if not in active preparation, which must have led to the effusion of blood, that has been thus so happily prevented. The movement, therefore, was in every way admirable, alike for its humanity [and] patriotism, as for its soldiership.

Very respectfully, your obedient servant,

 J. HOLT,

Secretary of War ad interim.