After a conference with the Secretary of War and the Secretary of the Navy, I thought it wise to assemble an Army division of full strength at San Antonio, Tex., a brigade of three regiments at Galveston, a brigade of Infantry in the Los Angeles district of southern California, together with a squadron of battleships and cruisers and transports at Galveston, and a small squadron of ships at San Diego. At the same time, through our representative at the City of Mexico, I expressed to President Diaz the hope that no apprehensions might result from unfounded conjectures as to these military maneuvers, and assured him that they had no significance which should cause concern to his Government.

The mobilization was effected with great promptness, and on the 15th of March, through the Secretary of War and the Secretary of the Navy, in a letter addressed to the Chief of Staff, I issued the following instructions: It seems my duty as Commander in Chief to place troops in sufficient number where, if Congress shall direct that they enter Mexico to save American lives and property, an effective movement may be promptly made. Meantime, the movement of the troops to Texas and elsewhere near the boundary, accompanied with sincere assurances of the utmost goodwill toward the present Mexican Government and with larger and more frequent patrols along the border to prevent insurrectionary expeditions from American soil, will hold up the hands of the existing Government and will have a healthy moral effect to prevent attacks upon Americans and their property in any subsequent general internecine strife. Again, the sudden mobilization of a division of troops has been a great test of our Army and full of useful instruction, while the maneuvers that are thus made possible can occupy the troops and their officers to great advantage.

The assumption by the press that I contemplate intervention on Mexican soil to protect American lives or property is of course gratuitous, because I seriously doubt whether I have such authority under any circumstances, and if I had I would not exercise it without express congressional approval. Indeed, as you know, I have already declined, without Mexican consent, to order a troop of Cavalry to protect the breakwater we are constructing just across the border in Mexico at the mouth of the Colorado River to save the Imperial Valley, although the insurrectos had scattered the Mexican troops and were taking our horses and supplies and frightening our workmen away. My determined purpose, however, is to be in a position so that when danger to American lives and property in Mexico threatens and the existing Government is rendered helpless by the insurrection, I can promptly execute congressional orders to protect them, with effect.

Meantime, I send you this letter, through the Secretary, to call your attention to some things in connection with the presence of the division in the Southwest which have doubtless occurred to you, but which I wish to emphasize.

In the first place, I want to make the mobilization a first-class training for the Army, and I wish you would give your time and that of the War College to advising and carrying out maneuvers of a useful character, and plan to continue to do this during the next three months. By that time we may expect that either Ambassador Wilson's fears will have been realized and chaos and its consequences have ensued, or that the present Government of Mexico will have so readjusted matters as to secure tranquillity-a result devoutly to be wished. The troops can then be returned to their posts. I understood from you in Washington that Gen. Aleshire said that you could probably meet all the additional expense of this whole movement out of the present appropriations if the troops continue in Texas for three months. I sincerely hope this is so. I observe from the newspapers that you have no blank cartridges, but I presume that this is an error, or that it will be easy to procure those for use as soon as your maneuvers begin.

Second. Texas is a State ordinarily peaceful, but you can not put 20,000 troops into it without running some risk of a collision between the people of that State, and especially the Mexicans who live in Texas near the border and who sympathize with the insurrectos, and the Federal soldiers. For that reason I beg you to be as careful as you can to prevent friction of any kind. We were able in Cuba, with the army of pacification there of something more than 5,000 troops, to maintain them for a year without any trouble, and I hope you can do the same thing in Texas. Please give your attention to this, and advise all the officers in command of the necessity for very great circumspection in this regard.

Third. One of the great troubles in the concentration of troops is the danger of disease, and I suppose that you have adopted the most modern methods for preventing and, if necessary, for stamping out epidemics. That is so much a part of a campaign that it hardly seems necessary for me to call attention to it.

Finally, I wish you to examine the question of the patrol of the border and put as many troops on that work as is practicable, and more than are now engaged in it, in order to prevent the use of our borderland for the carrying out of the insurrection. I have given assurances to the Mexican ambassador on this point.

I sincerely hope that this experience will always be remembered by the Army and Navy as a useful means of education, and I should be greatly disappointed if it resulted in any injury or disaster to our forces from any cause. I have taken a good deal of responsibility in ordering this mobilization, but I am ready to answer for it if only you and those under you use the utmost care to avoid the difficulties which I have pointed out.

You may have a copy of this letter made and left with Gen. Carter and such other generals in command as you may think wise and necessary to guide them in their course, but to be regarded as confidential. I am more than happy to here record the fact that all apprehensions as to the effect of the presence of so large a military force in Texas proved groundless; no disturbances occurred; the conduct of the troops was exemplary and the public reception and treatment of them was all that could have been desired, and this notwithstanding the presence of a large number of Mexican refugees in the border territory.