They found it to be no more than eighteen or twenty miles, Sacajawea's extraordinary short cut between the Missouri and the Yellowstone. They struck the latter river below the mouth of its great cañon, found good timber, and soon were busy felling great cottonwoods to make dugout canoes. Two of these, some thirty feet in length, when lashed side by side, served to carry all their goods and some of their party. The rest--Pryor, Shannon, Hall and one or two others--were to come on down with the horses.
The mounted men did well enough until one night the Crows stole all their horses, and left them on foot in the middle of the wilderness. Not daunted, they built themselves boats of bull hide, as they had seen Indians do, and soon they followed on down the river, they could not tell how far, to the rear of the main boat party. With the marvelous good fortune which attended the entire expedition, they had no accident; and in time they met the other explorers at the mouth of the Yellowstone, after traveling nine hundred miles on a separate voyage of original discovery!
It was on the eighth of August that the last of Clark's boats arrived at the Yellowstone rendezvous. His men felt now as if they were almost at home. The Mandan villages were not far below. As soon as Captain Lewis should come, they would be on their way, rejoicing. Patient, hardy, uncomplaining, they did not know that they were heroes.
What of Lewis, then gone so long? He and his men were engaged in the yet more dangerous undertaking of exploring the country of the dreaded Blackfeet, known to bear arms obtained from the northern traders. They reached the portage of the Great Falls without difficulty, and eagerly examined the caches which they had left there. Now they were to divide their party.
"Sergeant Gass," said Captain Lewis, "I am going to leave you here. You will get the baggage and the boats below the falls, and take passage on down the river. Six of you can attend to that. I shall take Drouillard and the Fields boys with me, and strike off toward the north and east, where I fancy I shall find the upper portion of Maria's River. When you come to the mouth of that river--which you will remember some of you held to be the real Missouri--you will go into camp and wait for us. You will remain there until the first day of September. If by that time we have not returned, you will pass on down the Missouri to Captain Clark's camp, at the mouth of the Yellowstone, and go home with him. By that time it will have become evident that we shall not return. I plan to meet you at the mouth of Maria's River somewhere about the beginning of August."