Famed mountain man and scout, Kit Carson, and The Pathfinder, John C. Fremont made three incredible explorations together to the western United States. The first was in 1842 with the second in the following year. The last was in 1845. Both were hugely successful and helped touch off a wave of emigration by pioneers. Fremont's scientific observations, geographic recordings, and appreciation for the beauty of the west filled his report to Congress. The parties endured extremely harsh extremes of weather, attacks by Native Americans (as well as help from them), and ventured into Mexico.