Mr. Seward to Lord Lyons.

My Lord: Perhaps you have a general knowledge of the atrocities and barbarous outrages which have recently been committed by the Sioux Indians in Minnesota, residing under the protection of treaties with the United States. For the present these hostilities have ceased, but information has been received from that State which excites apprehensions of a renewal of them. I ask the favor to give you an extract of a letter of this character which comes from Mr. Peter Roy, at Red Lake, under the date of December 20. It is hoped that you may think it not improper to address the colonial authorities on the northern frontier, with a view to prevent, if possible, hostile Indians residing on either side of the frontier from being supplied with arms, ammunition, or military stores, to be used against the peaceful inhabitants of the United States.

I avail myself of this opportunity to renew to your lordship the assurance of my high consideration.

WILLIAM H. SEWARD.

Right Honorable Lord Lyons, &c., &c., &c.

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Sir: With this I have the honor to enclose an extract from a letter of Mr. Peter Roy, a half-breed Chippewa, in the temporary employment of this department, and respectfully request that you will take such action in the premises as, in your judgment, the public safety requires.

I beg leave to add, that there exists a very general apprehension among the citizens of Minnesota that the Sioux Indians, now in hostility against them, will obtain supplies of arms and ammunition from the merchants and traders in the British possessions, who are protected by that government.

Very respectfully, your obedient servant,

J. P. USHER, Secretary.

Hon. William H. Seward, Secretary of State.

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Extract of a letter received from Mr. Peter Roy, an employe of the government, by the honorable H. M. Rice, United States Senate, dated “Red Lake, December 20, 1862:”

“There is a large number of Sioux about Devil’s lake; they are coming in daily at St. Joseph in large numbers; they are bound to have ammunition, and they are preparing to go to Fort Garry in very large numbers, to demand for powder. The governor, Mr. Tavish, has heard of it, and he has sent a message to them not to come—that they could not have any; but the Indians have determined to go, and they are going, and people there expect to have trouble with them; and also the Sioux, from all accounts, are making big preparations for a spring campaign.”