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https://en.wikipedia.org/wiki/Hugh_Glass

In 1822, Glass responded to an advertisement in the Missouri Gazette and Public Advertiser placed by General William Henry Ashley, which called for a corps of 100 men to “ascend the river Missouri” as part of a fur-trading venture. Many others who later earned reputations as famous mountain men also joined the enterprise, including James Beckwourth, Thomas Fitzpatrick, David Jackson, William Sublette, Jim Bridger, and Jedediah Smith. These men would later be known as “Ashley’s Hundred”.

The expedition was attacked in May 1823 by Arikara warriors, and Glass was apparently shot in the leg. Fearing that continuing up the Missouri would make them vulnerable to further attack, at least some of the party, including Glass, chose to travel overland towards the Yellowstone River.

Near the forks of the Grand River, in present-day Perkins County, South Dakota, while scouting for game for the expedition larder, Glass surprised and disturbed a grizzly bear with two cubs. The bear charged, picked him up, bit and lacerated his flesh, severely wounding him, and body slammed him to the ground. Glass managed to kill the bear with help from his trapping partners, Thomas Fitzpatrick and Jim Bridger, but was left badly mauled and unconscious. General Ashley, who was also with them, became convinced he would not survive his injuries.

Ashley asked for two volunteers to stay with Glass until he died, and then bury him. Young Jim Bridger, then 19 years old, and John S. Fitzgerald, then 23 years old, stepped forward, and as the rest of the party moved on, began digging his grave.[5][6] Later, claiming that they were interrupted by attacking Arikara Native Americans, the pair grabbed the rifle, knife, and other equipment belonging to Glass, and took flight. Bridger and Fitzgerald later caught up with the party and incorrectly reported to Ashley that Glass had died. There is a debate whether Bridger was one of the men who abandoned Glass.[7]

The 200 mile route of the 1823 odyssey by Glass
Despite his injuries, Glass regained consciousness, but found himself abandoned, without weapons or equipment. He had festering wounds, a broken leg, and deep cuts on his back that exposed his bare ribs. Glass lay mutilated and alone, more than 200 miles (320 km) from the nearest American settlement, at Fort Kiowa, on the Missouri River. Glass set the bone of his own leg, wrapped himself in the bear hide his companions had placed over him as a shroud, and began crawling back to Fort Kiowa. To prevent gangrene, Glass laid his wounded back on a rotting log filled with maggots and let the maggots eat the dead, infected flesh, from the rest of his healthy body.

Glass crawled overland south toward the Cheyenne River, using Thunder Butte as a navigational tool, where he fashioned a crude raft and floated downstream to Fort Kiowa. The journey took him six weeks. He survived mostly on wild berries and roots; on one occasion he was able to drive two wolves from a downed bison calf, and feast on the raw meat. Glass was aided by friendly Native Americans who sewed a bear hide to his back to cover the exposed wounds and provided him with food and weapons.

After recovering from his wounds, Glass set out again to find Fitzgerald and Bridger. He eventually traveled to Fort Henry, on the Yellowstone River, but found it deserted; a note indicated that Andrew Henry and company had relocated to a new camp at the mouth of the Bighorn River. Arriving there, Glass found Bridger, but apparently forgave him because of his youth, and then re-enlisted with Ashley’s company.[4]

Glass later learned that Fitzgerald had joined the army and was stationed at Fort Atkinson, in present-day Nebraska. He traveled there as well, where Fitzgerald returned his stolen rifle. Glass reportedly spared Fitzgerald’s life because of the heavy penalty for killing a soldier of the United States Army.

In the period intervening, between finding Bridger and Fitzgerald, Glass and four others were dispatched by Ashley in 1824 to find a new trapping route: up the Powder River, then across and down the Platte River to the bluffs. The party set off in a bull boat, and near the junction of the Laramie River. They discovered a settlement of some 38 lodges, with several Native Americans on the shore. The Natives appeared to be friendly, and the trappers initially believed them to be Pawnees. After going ashore and dining with the residents, they realized the population to be Arikara. The men quickly got in the bull boat and paddled for the far shore, the ensuing chase ending with both parties landing simultaneously. Two of the men, Marsh and Dutton, escaped and reunited later with the trapping party, but two other men, More and Chapman, were quickly overtaken and killed by the pursuing war party. Glass managed to hide behind the river rocks. Glass also found his knife and flint in his shot pouch after the ordeal. He fell in with a party of Sioux and traveled with them back to Fort Kiowa.

Glass returned to the frontier as a trapper and fur trader. He was later employed as a hunter for the U.S. Army garrison at Fort Union, now Williston, North Dakota.

Glass was killed, along with two of his fellow trappers, in an attack by the Arikara on the Yellowstone River in the winter of 1833. Like many of his fellow mountainmen, including Jedediah Smith, his life ended violently.

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http://www.legendsofamerica.com/na-arikara.html

In 1804, when Lewis and Clark visited the Arikara, they were disposed to be friendly to the United States, but, owing to intrigues incident to the rivalry between trading companies, which brought suffering to the Indians, they became hostile.

In 1823 the Arikara attacked an American trader’s boats, killing 13 men and wounding others. This led to a conflict with the United States, referred to as the Arikara War, but peace was finally concluded. In consequence of these troubles and the failure of crops for two successive years the tribe abandoned their villages on the Missouri River and joined the Skidi on the Loup River in Nebraska, where they remained two years.