The next order from the Government sent Frémont, in the spring of 1843, to begin exploring where he had left off in 1842; to connect his survey with that of Commodore Wilkes on the Pacific coast. Kit Carson was again his guide; many of the previous expedition enlisted, 32 men in all. Across the forks of the Kansas the route lay west of Fort Laramie, through the Medicine Butte Pass and the South Pass to the northern end of Great Salt Lake. Frémont's report of this region led the Mormons to settle at Salt Lake afterward, believing they would be in Mexican territory. The record of this expedition, like the preceding one, is a story of fearful suffering and heroic endurance. It is given in detail in Frémont's "Memoirs," and Benton's "Thirty Years in the Senate." Deep snows on the mountains, no sign of the Buena Ventura River, Indians refusing to guide such a foolhardy venture; "skeleton men leading skeleton horses;" the descent into the Sacramento Valley at last, and the arrival at Fort Vancouver, November 1843, gives but a glimpse of the heroism of this second expedition. The suffering endured in reaching the coast was as nothing to that of the return through the great valley between the Rockies and the Sierra Nevada, looking for the river they were the first to prove did not exist at all. From San Francisco back to Salt Lake, three thousand five hundred miles in eight months, not once out of the sight of snow. Geography had gained an important fact--the Colorado was the only river flowing from the Rocky Mountains on that part of the continent. For eight months not a word had been heard from the party, at the East, and then Frémont came home "thin as a shadow," and Mrs. Frémont could tell him that she might have prevented his going at all had she chosen, for an order from Washington, countermanding the expedition, had been received by her addressed to her husband, soon after his departure from St. Louis. The expedition was not too far away when the despatch came for her to get it to him, but she decided to withhold it. Because he had taken a mountain howitzer in his outfit he was ordered to stay at home. What a scientific expedition could want of a howitzer was not plain to the authorities, who seemed to think that hostile Indians knew at sight the difference between a military and a scientific party and would respect it. Mrs. Frémont tells the story in _The Century_ for March, 1891, how she not only did not send on the despatch, but a messenger instead, bidding Frémont "Go on at once without asking why," so fearful was she a duplicate order might defeat his going at all.