On June 15, 1842, John C. Frémont set off from the Kansas River on his first expedition of the Oregon Trail with frontierman Kit Carson as his guide. An excerpt from the article:
"In June 1842, Army topographer Lt. John Charles Frémont and 22 men left Chouteau’s Trading Post near present-day Kansas City to survey a wagon trail that would lead through the northern Rockies to Oregon. By August a small splinter group led by Frémont and his most famous scout, Kit Carson, snaked their way through the Wind River Mountains, determined to plant a flag on what was believed to be the continent’s highest peak.
After altitude-induced headaches and vomiting frustrated their first summit attempt, Frémont and the five he had selected for the final climb again launched the perilous trek through rocky gorges and defiles to a meadow above three glacier lakes, where they turned their mules loose to graze and began the last slow trudge toward the snow-capped summit, which would be named Fremont Peak.
He replaced his thick parfleche moccasins with a light pair “as now the use of our toes became necessary to a further advance.” An overhanging buttress blocked their way, forcing them to ascend a granite precipice. He leaped onto the narrow crest, nearly plunging 500 feet off the other side. As he caught his breath in that absolute stillness, a bumblebee appeared—or so the legend goes. “It was a strange place, the icy rock and the highest peak of the Rocky Mountains, for a lover of warm sunshine and flowers,” wrote Frémont. “We pleased ourselves with the idea that he was the first of his species to cross the mountain barrier—a solitary pioneer to foretell the advance of civilization.” They mounted their barometer on the summit and measured the altitude at 13,500 feet (which would turn out not to be the highest peak in the Rockies)."