What rendered this intelligence the more disquieting was the inability of the Astorians, in their present reduced state as to numbers, and the exigencies of their new establishment, to furnish detachments to penetrate the country in different directions, and fix the posts necessary to secure the interior trade.

It was resolved, however, at any rate, to advance a countercheck to this post on the Spokan, and one of the partners, Mr. David Stuart, prepared to set out for the purpose with eight men and a small assortment of goods.  He was to be guided by the two Indians, who knew the country and promised to take him to a place not far from the Spokan River, and in a neighborhood abounding with beaver.  Here he was to establish himself and to remain for a time, provided he found the situation advantageous and the natives friendly.

On the 15th of July, when Mr. Stuart was nearly ready to embark, a canoe made its appearance, standing for the harbor, and manned by nine white men.  Much speculation took place who these strangers could be, for it was too soon to expect their own people, under Mr. Hunt, who were to cross the continent.  As the canoe drew near, the British standard was distinguished:  on coming to land, one of the crew stepped on shore, and announced himself as Mr. David Thompson, astronomer, and partner of the Northwest Company.  According to his account, he had set out in the preceding year with a tolerably strong party, and a supply of Indian goods, to cross the Rocky Mountains.  A part of his people, however, had deserted him on the eastern side, and returned with the goods to the nearest Northwest post.  He had persisted in crossing the mountains with eight men, who remained true to him.  They had traversed the higher regions, and ventured near the source of the Columbia, where, in the spring, they had constructed a cedar canoe, the same in which they had reached Astoria.

This, in fact, was the party despatched by the Northwest Company to anticipate Mr. Astor in his intention of effecting a settlement at the mouth of the Columbia River.  It appears, from information subsequently derived from other sources, that Mr. Thompson had pushed on his course with great haste, calling at all the Indian villages in his march, presenting them with British flags, and even planting them at the forks of the rivers, proclaiming formally that he took possession of the country in the name of the king of Great Britain for the Northwest Company.  As his original plan was defeated by the desertion of his people, it is probable that he descended the river simply to reconnoitre, and ascertain whether an American settlement had been commenced.

Mr. Thompson was, no doubt, the first white man who descended the northern branch of the Columbia from so near its source.  Lewis and Clarke struck the main body of the river at the forks, about four hundred miles from its mouth.  They entered it from Lewis River, its southern branch, and thence descended.