“Sir:–I have received undoubted information that the section of this State near Rock Island is actually invaded by a hostile band of the Sac Indians, headed by Black Hawk; and in order to repel said invasion, and to protect the citizens of the State I have, under the provisions of the Constitution of the United States and the laws of this State, called on the militia, to the number of seven hundred men, who will be mounted and ready for service in a very short time. I consider it my duty to lay before you the above information, so as you, commanding the military forces of the United States in this part of the Union, may adopt such measures in regard to said Indians as you deem right. “The above-mentioned mounted volunteers (because such they will be) will be in readiness immediately to move against said Indians, and, as Executive of the State of Illinois, I respectfully solicit your co-operation in this business. Please honor me with an answer to this letter. “With sincere respect for your character, “I am, your obedient servant, “JOHN REYNOLDS.” To which rather tart epistle General Gaines replied instanter: “H.Q. Western Department, May 29, 1831. “His Excellency, GOVERNOR REYNOLDS. “Sir:–I do myself the honor to acknowledge the receipt of your letter of yesterday’s date, advising me of your having received undoubted information that the section of the frontier of your State near Rock Island is invaded by a hostile band of Sac Indians, headed by a chief called Black Hawk. That in order to repel said invasion, and to protect the citizens of the State, you have called on the militia to the number of seven hundred militiamen, to be in readiness immediately to move against the Indians, and you solicit my co-operation. “In reply, it is my duty to state to you, that I have ordered six companies of the regular troops stationed at Jefferson Barracks to embark to-morrow morning and repair forthwith to the spot occupied by the hostile Sacs. To this detachment I shall, if necessary, add four companies. With this force I am satisfied that I shall be able to repel the invasion and give security to the frontier inhabitants of the State. But should the hostile band be sustained by the residue of the Sac, Fox and other Indians, to an extent requiring an augmentation of my force, I will, in that event, communicate with your Excellency by express, and avail myself of the co-operation which you propose. But, under existing circumstances, and the present aspect of our Indian relations on the Rock Island section of the frontier, I do not deem it necessary or proper to require militia, or any other description of force, other than that of the regular army at this place and Prairie du Chien. “I have the honor to be, very respectfully,