Following the return passage of Lewis and Clark in 1805/06 there is no record of any white man visiting the Great Falls of the Missouri until explorer and trapper Jim Bridger reached them in 1822. White people next visited the Great Falls when Bridger and Major Andrew Henry led a fur-trading expedition there in April 1823 (and were attacked by Blackfeet Indians while camping at the site). British explorer Alexander Ross trapped around the Great Falls in 1824. In 1838, a mapping expedition sent by the U.S. federal government and guided by Bridger spent four years in the area. Margaret Harkness Woodman became first white woman to see the Great Falls in 1862.