The James brothers were most active as members of their own gang from about 1866 until 1876, when as a result of their attempted robbery of a bank in Northfield, Minnesota, several members of the gang were captured or killed.
Braća James bila su najaktivnija u desetogodišnjem vremenskom razdoblju od 1866. do 1876., dok njihov pokušaj pljačke banke u Northfieldu u Minnesoti nije rezultirao smrću ili zarobljavanjem nekoliko članova bande.