How did Sacajawea help Lewis and Clark?

Sacagawea (c. 1790-1812 or 1884) A near-legendary figure in the history of the American West for her indispensible role on the Lewis and Clark Expedition, Sacagawea has become an enigma for historians seeking to trace her later life. The daughter of a Shoshone chief, Sacagawea was kidnapped by the Hidatsa when she was about ten years old and taken back to their village on the upper Missouri.

There, she and another captive girl were purchased and wed by Toussaint Charbonneau, a French Canadian trapper. When Lewis and Clark engaged Charbonneau as an interpreter for their expedition in 1804, it was with the understanding that Sacagawea would also accompany them. Aside from her value as an interpreter, they expected her mere presence to speak well of them to Indians they would encounter along the way.

As Clark noted in his journal, "a woman with a party of men is a token of peace." The information you need is here.

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