After the Civil War Cox returned to Gallatin, where he formed the mercantile firm of Ballinger, Cox & Kemper. Ballinger was another military officer and J.M. Kemper, a businessman who was the father of
William Thornton Kemper Sr. who went on to found two of the largest banks headquartered in Missouri (
Commerce Bancshares and
UMB Financial Corporation). Cox's business relationship with Kemper only lasted one year, dissolving in 1866. On December 7, 1869, two men (reported to be Frank and Jesse James) robbed the Daviess County Savings Association Bank and in the process shot the cashier John W. Sheets in the head and heart. Although there was $700 in the bank the robbers left with only $5 in
fractional currency. The men were encountered near
Kidder, Missouri where one of the men (believed to be Jesse) said that he was the brother of Bill Anderson and that he had avenged Anderson's murder by Cox. The Gallatin Bank Robbery marked the first time that Frank and Jesse were formally identified as bank robbers. A reward of $3,000 was raised for their capture. Jesse sent a letter to the Kansas City Times saying that he was innocent and could prove he was not in the area. He said he would surrender but was concerned that he would be lynched before he could prove his innocence. After Jesse James was killed in 1882, Frank James surrendered to the authorities. Frank was not tried for the bank murder however he was tried in 1883 in Gallatin for an 1881 murder of a Rock Island Railroad employee at nearby
Winston, Missouri. A jury acquitted him. Cox was reported to have been in California in 1869 visiting his parents and did not return until 1870 when he continued to operate other business including a hotel, livery and a different mercantile until formally retiring in 1871. ==References==