Mr. Cockrum, in the work above mentioned, also published certain valuable papers of a Captain William Hargrove which revealed that in 1807 the troubles were so acute that a ranger service was organized to patrol the frontier. This body was formed into three divisions, one taking the country from the Wabash eastward to the neighborhood of the French Lick springs; another from that point to the Falls of the Ohio; and the third from the falls to Lawrenceburg. The commander of one of these divisions was Captain Hargrove, and the papers mentioned, being letters of instruction to him from John Gibson, Secretary of the Indiana Territory, throw considerable light on that particular period and its dangers (Cockrum's "Pioneer History of Indiana," pp. 202-29).