A correspondent writing from Camp Grant, Arizona, May 5th, says; "A daring exploit was enacted about five miles from Camp Grant, Arizona, by a band of hardy pioneers and noble citizens of Tucson, Arizona, numbering, it is calculated, about 400, including Papagoes and Mexicans, led by would-be white men, armed with breech-loading arms that were supplied to the Territorial Government. At day-break on Sunday morning 300 of these men came down in all their strength on an encampment of 500 Indians (about 150 of these were men, the rest were women and children) that were under the protection of the Government, having surrendered themselves and being considered prisoners of war.

THE INDIANS HAVE BEEN WORKING ASSIDUOUSLY EVERY DAY

For the past two months for their sustenance by carrying hay on their backs from eight to ten miles for the benefit of this post, and for Government animals. Out of the 500 here encamped, and depending on the Government for protection, there were murdered in the most fiendish manner

SEVENTY CHILDREN,

And eight bucks, as they were running away, were dropped in their tracks. About thirty-five children and one woman were taken captive. The woman was afterward shot and her hair cut off to decorate the horses of these gallant warriors. Mr. Lord, the United States Treasurer at Tucson, A.T., had the manhood to express his unqualified disapproval of this massacre, and he has been threatened with a dose of tar and feathers by these inhuman butchers. I was out to the slaughter-pen, and my belief is that in

FIENDISHNESS AND ATROCITY

It surpassed any deed of crime that has been enacted since the establishment of this republican Government. It remains to be seen if the United States Government will mete out justice to the murderers of those whom it promised to protect; or, if their wards shall be butchered, and the perpetrators go at large, boasting of their iniquitous deeds and gagging honest men from expressing their opinions through fear of the pistol or other mob violence. This deed was not done because they were guilty of any crime of late, but from a natural dislike those Territorial people have of seeing them on a Reservation, after the news reached Tucson, they boasted of

FORMING A GANG TO "CLEAN THEM OUT."

This was considered mere bravado; no person supposed that they seriously entertained the idea of coming in open contact with the Government, or anything pertaining thereto. Captain Thomas Dunn, commanding Camp Lowell, Tucson, and Company F, Twenty-first Infantry, forwarded on the 29th (Saturday afternoon), about 4 o'clock, a sergeant and a private from his company (mounted), with a dispatch to Grant, stating that these men had organized for the purpose of massacreing the Indians at Camp Grant, but either by the collusion of the bearers, or by their being forcibly detained, did not reach Camp Grant until half past 7 o'clock A.M, on the 30th of April, about

THREE HOURS TOO LATE.

Why this delay occurred or how it was occasione I cannot be ascertained, until there is an inquiry into the whole affair. When the people were in the mountains and prepared for a hostile encounter, not twenty men could be found to accompany a scout of Lieutenant Cushing's, to pursue and punish them for a murder committed by them whilst capturing stock; but now, when living in good faith under the protection of the Government, and their warriors unprepared for any such emergency, their women and children are wantonly butchered at the dawn of day, and when no adequate force was in the post to pursue and punish the inhuman cut-throats, Captain Stanwood and cavalry being away with Troop H, Third Cavalry.