Upon leaving the Great Falls of the Missouri on July 15, 1805, the Lewis and Clark expedition began to search in earnest for the Shoshone from whom they hoped to purchase horses for their journey over the Rockies. The next day, Lewis identified an abandoned but recent Shoshone camp with a wickiup and signs of numerous horses, but the Indians remained elusive. The captains decided to split up and have Clark take a detachment ahead while Lewis brought up the boats and the rest of the Corps.

As Lewis and Clark continued their journey up the Missouri River in 1805, the Corps was moving further and further from civilization with every stroke of their paddles. Although the Corps had been made aware of the countless wonders to the west through conversations with the Mandans and Hidatsas, it was quite another thing to observe the wonders for themselves, and at seemingly every bend in the river there were new discoveries.

The Corps of Discovery arrived at the Mandan villages near present day Bismarck, North Dakota, in late October 1804 and prepared to settle in for the long winter. For the past five months, the Lewis and Clark expedition had spent most days rowing or pushing their keelboat against the Missouri River’s powerful current, and the men were ready for a break. They were now 1,300 river miles upstream from the nearest civilized settlement and, although they did not know it, they had over 2,000 miles to go to reach the Pacific Ocean.