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Sergeant Gass, said Captain Lewis,
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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.