In 1841, Mr. Fremont was ordered to examine the Desmoines River, in Iowa--then a wilderness; and when it was performed, he returned to marry Jessie Benton, the young daughter of Thomas H. Benton. The next year he projected his first great exploring expedition to the Rocky Mountains, setting out from Washington, May 2, 1842. The results of the expedition were great and made a deep impression upon the Government and nation, and a second expedition was ordered, much more complete in preparation than the first. The party left Kansas in May, 1843, and did not get back to the United States until August of 1844. The tour was full of dangers and thrilling incidents, and the results were still more striking than those of the first expedition. Col. Benton sketched the expedition in a few eloquent words, as follows: "'The Government deserves credit for the zeal with which it has pursued geographical discovery.' Such is the remark which a leading paper made upon the discoveries of Fremont, on his return from his second expedition to the great West; and such is the remark which all writers will make upon all his discoveries who write history from public documents and outside views. With all such writers the expeditions of Fremont will be credited to the zeal of the Government for the promotion of science, as if the Government under which he acted had conceived and planned these expeditions, as Mr. Jefferson did that of Lewis and Clark, and then selected this young officer to carry into effect the instructions delivered to him. How far such history would be true in relation to the first expedition, which terminated in the Rocky Mountains, has been seen in the account which has been given of the origin of that undertaking, and which leaves the Government innocent of its conception; and, therefore, not entitled to the credit of its authorship, but only to the merit of permitting it. In the second, and greater expedition, from which great political as well as scientific results have flowed, their merit is still less; for, while equally innocent of its conception, they were not equally passive to its performance--countermanding the expedition after it had begun--and lavishing censure upon the adventurous young explorer for his manner of undertaking it. The fact was, that his first expedition barely finished, Mr. Fremont sought and obtained orders for a second one, and was on the frontier of Missouri with his command, when orders arrived at St. Louis to stop him, on the ground that he had made a military equipment which the peaceful nature of his geographical pursuit did not require! as if Indians did not kill and rob scientific men as well as others, if not in a condition to defend themselves. The particular point of complaint was that he had taken a small mountain howitzer, in addition to his rifles; and which, he was