Undaunted Courage: Meriwether Lewis, Thomas Jefferson, and the Opening of the American West

by Stephen E. Ambrose

May 23, he wrote, “Capt Lewis’ assended the hill which has peninsulis projecting in raged pints to the river, and was near falling from a Peninsulia of rocks 300 feet, he caught at 20 foot. Saved himself by the assistance of his Knife.”