内容简介：
In the fall of 1830, Joseph Walker, Billy B. and Swit trail horses down to Fort Gibson. Walker met with Army Captain Benjamin Bonneville about his joining, and the somewhat questionable motive behind, the captain's upcoming Western expedition. He returns to Missouri, leaving Swit and Billy to winter at Gibson. Billy, Swit and an Indian named Oo-tse-tee travel to Santa Fe before heading to Fort Osage, where Swit signed on with Bonneville's fur trapping company. Billy makes his way back to New Mexico, where he becomes involved with a local rancher and his family. They travel the Old Spanish Trail into the California settlements. Bonneville's caravan is the first to take wagons over the Continental Divide into Oregon Territory. Following the 1833 Green River rendezvous, Walker leads forty men across the Great Basin and over the Sierras into California. South Pass is an entertaining blend of fictional characters into the chronology and accomplishments of the Bonneville-Walker expedition.