Mr. Primm, the writer of this interesting narrative, has probably not been fully informed in regard to the extent of Colonel George Rogers Clark's participation in this affair. In a written memorandum now before us, made on the authority of his brother, General William Clark of St. Louis, who it is presumed has possession of his father's official papers, it is stated, in reference to this affair, that although the Spanish Governor could not be made to believe that an attack was intended, the principal inhabitants sent over an express to Colonel Clark, who was then at Kaskaskia with five hundred men, to come and protect them. He accordingly marched his force up opposite the town and encamped a little distance from the river. He did not send over any troops, but was to do so, in case of an attack; when it was actually made Colonel Clark crossed the river; and upon seeing the "long knives," as the Indians called his troops, they hastily retreated, having killed seventy-two or seventy-three of the Spaniards, before his arrival. This sudden appearance of Colonel Clark, upon the scene of action, explains the conduct of the Indians. So large a body of warriors, making a preconcerted attack, upon a town but badly protected, would not, it is thought, have given up the assault so suddenly and before they had lost a single man, unless alarmed by the presence of a superior force. On the supposition that Colonel Clark actually crossed the river with his troops, the flight of the Indians is easily explained. They were probably apprised of Colonel Clark's being at Kaskaskia, and his name was every where a terror to the Indians. As an evidence of this, a short time afterwards, he sent a detachment of one hundred and fifty men, as far up the country as Prairie des Chiens, and from thence across Rock and Illinois rivers and down to Kaskaskia, meeting with no molestation from the Indians, who were struck with terror at the boldness of the enterprise, saying that if so few dared to come, they "would fight like devils." General William H. Harrison, long familiar with the North West Indians, in an official letter to the secretary at War, dated H.Q. Cincinnati, March 22d, 1814, giving an able view of the Indian tribes, makes the following remarks on the descent of this northern confederacy, upon the great Illini nation.