No white man had as yet crossed the vast stretches of country that lay west of the rolling Mississippi, and it was the boldest undertaking ever known when President Jefferson influenced Congress to stand back of his proposition to learn the extent of the possessions that had recently come to the United States. ([Note 1].)[1]
The President’s private secretary, Captain Lewis, headed the small party of adventurous spirits, assisted by an army officer, Captain Clark. They left St. Louis in the spring of 1804, and had been long on the way when the Armstrongs discovered that the one man whom they could depend on to save their homes was with the expedition.
Ordinarily Bob and Sandy Armstrong would have been quick to take upon themselves the duty of overtaking the expedition, and securing the necessary signature; but a recent injury prevented one of the brothers from going.
In the end the proposition of Dick and Roger to undertake the stupendous task was agreed to, and the boys started, mounted on two horses and equipped as well as the times permitted. The adventures they met with were thrilling in the extreme, and have been described at length in earlier volumes.[2]
The youths overtook the expedition after it had gone far up the “Great Muddy,” as the Missouri had already become known, and the coveted signature was obtained. Then the lads were tempted to continue with the party, since Captain Lewis was sending back one of his most trusted scouts with an account of what had already happened to the expedition, for the perusal of President Jefferson; and he could be trusted to see that the precious document reached the Armstrongs.
During the winter just passed the two boys were kept busy in the rôle of scouts and providers of fresh meat for the camp, a duty which their early training made them peculiarly fitted to assume.
The expedition had laid out a comfortable camp near the Indian village of the Mandan tribe, with whom peaceful relations had been established at the time of their first arrival in the neighborhood.
Some of the bolder spirits had ventured into the realm of natural wonders now known as Yellowstone Park, and had viewed with amazement and awe the strange geysers that spouted hot water hundreds of feet in the air at stated periods, as well as many other singular mysteries.