A Nation Glimpsed Long Before They Were Met
The Lemhi Shoshone — the band of Northern Shoshone inhabiting the headwaters of the Missouri and the valleys west of the Continental Divide — entered the journal record long before the Corps of Discovery actually encountered them. They appear first as an absent people, defined by what had been done to them. On 4 November 1804, at the Mandan villages, Toussaint Charbonneau approached the captains seeking employment, bringing with him a young woman whose biography would tie the expedition’s fate to the Shoshone:
A Mr. Chaubonee interpreter for the Gross Ventre nation came to See us, and informed that he came Down with Several Indians from a Hunting expedition up the river.
Sacagawea, captured as a child by a Hidatsa raiding party and carried east to the Knife River villages, was Lemhi Shoshone. The captains’ decision to retain Charbonneau was driven almost entirely by her presence: a Shoshone speaker would be indispensable when the expedition reached the mountains and needed to bargain for horses. The Lemhi, in other words, shaped the personnel decisions of the Corps months before any member of the expedition had laid eyes on them.
Approaching Shoshone Country
By late July 1805 the expedition had ascended the Missouri to its three forks. Here the landscape itself began to speak in Shoshone terms. On 28 July 1805 Lewis recorded Sacagawea’s recognition of the country around her:
Our present camp is precisely on the spot that the Snake Indians were encamped at the time the Minnetares of the Knife river first came in sight of them five years since.
The journal entry establishes several facts about the Lemhi as the expedition understood them. They were called “Snake Indians” in the parlance of the fur trade. They ranged east of the divide as far as the Three Forks for hunting and were vulnerable there to Hidatsa (“Minnetare”) raids out of the Knife River. The five-year-old memory of a violent dispossession framed the Corps’ first sense of Lemhi territoriality: a people who had been pushed westward by better-armed neighbors and who now lived chiefly on the western slope of the Rockies.
The Reunion at Camp Fortunate
The decisive moment in the expedition’s relationship with the Lemhi came on 17 August 1805, when Lewis’s advance party finally brought a Shoshone band into council with Clark’s main party. The negotiations required Sacagawea’s interpretation, and as she was led forward she recognized the chief sitting opposite the captains. The journal records the scene with unusual emotional vividness:
She instantly jumped up, and ran and embraced him, throwing over him her blanket, and weeping profusely.
The chief was Cameahwait, her brother. The captains named the place Camp Fortunate, and the name was deserved: the first Lemhi band the expedition met was led by the brother of their interpreter. Whatever bargaining position the Corps might otherwise have had — a small, ill-supplied party deep in unfamiliar mountains, dependent on people they could not understand — was transformed by a kinship bond that no captain had engineered.
Why the Lemhi Mattered: Horses and Geography
The Lemhi Shoshone occupied a strategic position that the captains had anticipated since the previous winter. They were a horse-owning people on the western edge of the Missouri drainage, with knowledge of the passes leading to navigable waters of the Columbia system. The expedition’s plan to descend to the Pacific depended on acquiring a sufficient herd of horses to cross the Bitterroots, and the Lemhi were the only people positioned to supply them. As the 17 August entry notes:
Cameahwait agreed to provide the horses the expedition needed to cross the Bitterroot Mountains — a transaction that might never have occurred without the personal bond between Sacagawea and her brother.
The journals emphasize the contingency. Without Sacagawea’s recognition of Cameahwait, the Lemhi might still have traded — they had reason to want American goods and American allies against the Hidatsa — but the speed and trust of the transaction owed everything to the family reunion. The horses obtained at Camp Fortunate carried the Corps over Lemhi Pass and through the Lolo Trail.
A People Pressed Between Enemies
The fragments of Lemhi life that surface in the journals consistently emphasize their precarious position. The 28 July entry’s reference to the Hidatsa raid five years earlier is not incidental: it explains why the Lemhi were cautious, why they preferred the western valleys to the buffalo country east of the divide, and why a well-armed American party offered both threat and opportunity. Sacagawea herself was a living testimony to that vulnerability — a Lemhi child carried hundreds of miles east as a captive and married to a French-Canadian trader before her teens.
The captains’ brief glimpses of Lemhi material life — their reliance on salmon and roots in seasons when buffalo could not be safely hunted, their desire for firearms to defend themselves against mounted enemies — sketch a nation living at the geographic and political edge of the Plains horse culture. They had horses in abundance but lacked the guns that made horses militarily decisive.
Limits of the Record
The Lemhi Shoshone appear in only a handful of the entries provided here, and the figure must be drawn cautiously. The three entries available — November 1804, July 1805, and August 1805 — frame the relationship in terms of its origin (Charbonneau’s hiring), its anticipation (the Three Forks), and its climax (Camp Fortunate). They do not, in the sample given, follow the expedition’s extended residence among the Lemhi in late August and early September 1805, when horses were actually purchased and guides recruited; nor do they record the return journey of 1806. The portrait here is therefore a portrait of first encounter, not of the sustained ethnographic observation that the captains undertook elsewhere in the journals.
What the available record does establish, unambiguously, is that the Lemhi Shoshone were not a peripheral nation in the expedition’s story but a central one. They were the people whose absence required Sacagawea’s hiring, whose territory the Corps spent the summer of 1805 searching for, and whose horses made the crossing of the Continental Divide possible. The journal’s most emotionally charged passage — Sacagawea throwing her blanket over her brother and weeping — is a Lemhi scene, and it stands at the hinge of the entire western journey.
Legacy in the Journals
If the Mandan winter taught the Corps how to survive the Plains, the Lemhi summer taught them how to leave the Missouri behind. The captains’ naming practices register the debt: Camp Fortunate, Lemhi Pass, and the careful preservation in the journals of Cameahwait’s name and Sacagawea’s recognition. For a nation represented in only a few entries of the surviving record, the Lemhi Shoshone are arguably the indispensable people of the expedition — the hinge on which the continental crossing turned.
