For 15 years Scotts Bluff would witness traders' caravans, going mountainward in early summer, and returning in the autumn laden with their harvest of furs.
(Scotts Bluff; would witness; traders' caravans; T:For 15 years) (Scotts Bluff; returning; T:in the autumn laden with their harvest of furs)
Scotts Bluff Scotts Bluff
would witness returning
traders' caravans T:For 15 years
T:in the autumn laden with their harvest of furs