After being forced from Nauvoo, Illinois, following the murder of Joseph Smith, Jr., the Mormons began their trek across Iowa in 1846 on the way to the Great Salt Lake Valley. From their first permanent campsite on Sugar Creek they travelled across southern Iowa to Winter Quarters, near present-day Omaha, and also established permanent camps at Garden Grove in Decatur County, Mount Pisgah in Union County, and Kanesville in Pottawattamie County. While camped by Locust Creek near Corydon, William Clayton learned of the birth of his son in Nauvoo and on April 15, 1846, wrote the hymn "Come, Come, Ye Saints," which became a great rallying song of the Mormons. That year, seven Mormon families became separated from the larger body of migrants, spent the winter in present-day Green Bay Township in Clarke County, and established Lost Camp, where they remained until 1854 before resuming the trek to Utah. Southern Iowa also saw several utopian experiments: Abner Kneeland founded Salubria in Van Buren County in 1839, but it dissolved after his death in 1844; followers of Charles Fourier founded Phalanx in Mahaska County in 1843, and it lasted only two years; followers of Etienne Cabet established Icaria in Adams County, which existed from 1860 to 1895; Hungarian refugees led by Ladislaus Ujhazy founded New Buda in Decatur County in 1850 before most moved to Texas in 1853 after economic difficulties; and people from near Farmington formed the Hopewell Colony in 1851, moved later that year to Clarke County, and founded Hopeville, whose village survived for several decades and was the only one of these southern Iowa utopian experiments whose remnants lasted into the 20th century.