General William H. Ashley, lieutenant-governor of the State of Missouri, a licensed trader, was treacherously attacked by the Arickara Indians at their village on the west bank of the Missouri River, about midway between the present Fort Sully and Fort Rice, on June 2, 1823. Twenty-three of the trading party were killed and wounded, and the remainder retreated in boats a considerable distance down the river, whence they sent appealing for succor to the commanding officer at Fort Atkinson, the present site of Council Bluffs. This officer was Col. H. Leavenworth, Sixth United States Infantry, who marched June 22, with 220 men of that regiment, 80 men of trading companies, and two 6-pound cannon, a 5-1/2-inch brass howitzer, and some small swivels, nearly 700 miles through a country filled with hostile or unreliable Indians to the Ree villages, which, after much hardship and some losses, he reached on the 9th of August. The Dakotas were at war with the Arickara or Rees, and 700 to 800 of their warriors had joined the United States forces on the way; of these Dakotas 500 are mentioned as Yanktons, but the tribes of the remainder are not designated in the official reports. The Rees were in two villages, the lower one containing seventy-one dirt lodges and the upper seventy, both being inclosed with palisades and a ditch, and the greater part of the lodges having a ditch around the bottom on the inside. The enemy, having knowledge of the expedition, had fortified and made every preparation for resistance. Their force consisted of over 700 warriors, most of whom were armed with rifles procured from British traders. On the 9th of August the Dakotas commenced the attack, and were driven back until the regular troops advanced, but nothing decisive resulted until the artillery was employed on the 10th, when a large number of the Rees, including their chief, Grey-Eyes, were killed, and early in the afternoon they begged for peace. They were much terrified and humbled by the effect of the cannon, which, though small, answered the purpose. During the main engagement the Dakotas occupied themselves in gathering and carrying off all the corn to be found, and before the treaty was concluded, which, at the supplication of the Rees, Colonel Leavenworth agreed to, the Dakotas all left in great disgust at not being allowed to kill and scalp the surrendered warriors with their squaws and pappooses, take possession of the villages, horses, etc., and in fact to exterminate their hereditary foes. However, the Rees, having become panic-stricken after the treaty and two days of peaceful intercourse with the soldiers, deserted their homes, and the troops, embarking on the 15th to descend the river, shortly saw the villages in flames, which was the work either of the Dakotas or of inimical traders.