The Assiniboine

Painting of American Indian woman in white dress and child in brown dress with tipis in the background.
George Catlin's "Assiniboine Woman and Child." The Philadelphia artist created this painting at Fort Union in 1832. "The dresses of the women and children," Catlin wrote, ". . . are usually made of the skins of the mountain-goat, and ornamented with porcupine’s quills and rows of elk’s teeth."


Assiniboine Origins

Assiniboine, pronounced uh-­SIN-uh-boin, comes from the Chippewa or Algonquian language family and means "those who cook with stones." This refers to stone boiling, the practice of heating stones directly in a fire and then placing them in water to boil it for cooking. British explorers and traders also used the name "Stoney" for the tribe. The Assiniboine term for themselves is "Nakodabi."

The Assiniboine speak a Siouan dialect and were once part of the Yanktonai Sioux, living as one people with them in the Lake Superior region of present-day Minnesota and southwestern Ontario. The Assiniboine split from the Sioux around 1640 and migrated westward onto the northern plains. They adopted the plains culture, becoming nomadic hunter-gatherers who moved their villages when necessary to find food. Assiniboine dress, shelters, tents, and customs are similar to those of the Plains Cree of the trans-border region of North Dakota, Montana, and Canada.

After acquiring horses through trade with other Indians, the Assiniboine ranged over greater expanses searching for buffalo and wild plants. Sometimes they traded meat and pelts with sedentary tribes on the Missouri River such as the Mandan and Hidatsa, receiving in exchange corn, squash, beans, sunflowers, and tobacco.


Once white traders entered their territory, the Assiniboine bartered furs with both the French and English, receiving firearms, gunflints, ammunition, and other European trade goods such as jewelry, knives, pigments, brass kettles, wool blankets, and metal implements like iron projectile points. It was the Assiniboine who aided white contact with the Mandan. In 1738, French fur trader and explorer La Verendrye accompanied an Assiniboine trading party south from a post in Manitoba, reaching a Mandan earthlodge village in central North Dakota, near today's Knife River Indian Villages National Historic Site.

Assorted trade goods arrayed on pillows and a black background.
A sampling of trade goods archeologists recovered during excavations at Fort Union. From left, top row then down: a brass Hawk bell, metal ring, fishhook, iron arrowhead, bone comb, earring pendant, conical earbob, gunflint, .50 caliber musket balls, and vermillion pigment. The dime provides scale.

NPS / FREDERICK MACVAUGH, FOUS 16835,70181, 94876, 16782, 32520, 83830,16885, 375, 2704, and 80228.

Fort Union and the Assiniboine

By 1828, when Fort Union was established, the Assiniboine inhabited northwest North Dakota, northeast Montana, and southern Saskatchewan. Kenneth McKenzie, Fort Union's first bourgeois or post manager, received permission from the Assiniboine to establish a trading post in their midst. McKenzie parlayed this agreement with the Assiniboine on behalf of John Jacob Astor and his American Fur Company.

The Assiniboine's vast knowledge of fur trading was of great value to the American Fur Company. As the dominant tribe in the Confluence area (where the Yellowstone River enters the Missouri), they exerted much influence and power and contributed to the success of Fort Union's fur business. During the fort's thirty-nine years in operation, the Assiniboine were the main trading partners; they also helped to protect the fort and its occupants from unfriendly bands or tribes such as the Blackfeet. Fort Union's employees and visitors found them to have a generous hospitality and formed great friendships with the tribe, including chiefs such as Crazy Bear. Many Assiniboine women became wives of Fort Union personnel, among them Bourgeois Edwin Denig, who in 1851 married Deer Little Woman, and clerk (later, Bourgeois) Charles Larpenteur, who married Makes Cloud Woman.

American Indian woman with hair pulled back wearing a dark dress with a white collar.
Deer Little Woman, the Assiniboine wife of Edwin T. Denig, Fort Union's bourgeois from 1848 to 1856. Traders often married women from the tribes they traded with; these women then helped create and sustain personal and trade relationships between their husbands and their families, bands, and tribe.


For some of their history, the Assiniboine allied with the Cree against the Blackfeet, who lived farther west on the Missouri River. No military post was established specifically to police the Assiniboine, and no American troops ever warred against them. Some Assiniboine worked as scouts for the military operating out of Fort Buford, the military post built three miles east of Fort Union in 1866 for the purpose of controlling the Confluence and protecting Montana-bound gold seekers. Assiniboine scouts in 1885 also assisted the Canadian North West Field Force in tracking down a group of mixed-blood people, the Métis, who rebelled in Canada.

Smallpox Tragedy

In 1837, tragedy struck the tribes on the Upper Missouri. The American Fur Company steamboat St. Peters arrived at Fort Union, inadvertently carrying an extremely virulent strain of smallpox. The disease reached the fort as a band of Assiniboine arrived to trade. The traders urged the people not to come, as the fort was a plague post, but they paid no heed. Other bands came as well and smallpox spread throughout the tribe. Before the disease, the Assiniboine numbered 10,000 people, a population the epidemic reduced at least by half.

Small log structure with tipis around it in a field.
Charles Larpenteur's short-lived trading post. It was located adjacent to the Fort Union–Fort Benton road and several hundred yards west Fort Union Trading Post. This road, which visitors can still see traces of today, followed a traditional Assiniboine war path into enemy territories to the west.


In 1867, the U.S. Army purchased and dismantled Fort Union, using the salvaged materials—timber and stone—to aid in the expansion of Fort Buford, which lasted as a military post until 1895. In his memoir, Forty Years a Fur Trader on the Upper Missouri, Fort Union's final bourgeois and subsequent operator of a short-lived independent trading post, Charles Larpenteur, recalled the reaction of the Assiniboine chief Crazy Bear: "We cannot understand those whites. We had a good country, which we always thought they would save for us; they have given it to our enemies [the Sioux]. Fort Union, the house built for our fathers,—in the heart of our country,—the soldiers have pulled it down to build their Fort Buford, where we are scarcely permitted to enter."

The Assiniboine Today

The chemistry of the Upper Missouri had changed. In the 1870s, different bands of the Assiniboine settled on reservations on either side of the United States–Canada border. Today in Montana, the Assiniboine share the Fort Belknap Reservation with the Gros Ventres and the Fort Peck Reservation with the Sioux. In Saskatchewan, they share one reserve with the Sioux and another with the Chippewa and Cree. A third band resides on two other reserves in Saskatchewan. The Assiniboine people's contributions to American history and the success of Fort Union were many, and they deserve to be recognized and celebrated. To start, visit our page dedicated to Crazy Bear, the peace-seeker who for a time nearly everyone opposed.

Last updated: April 24, 2021

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