By RICH GRANT On the afternoon of June 25, 1876, on high bluffs above the Little Big Horn River, Coronel George Armstrong Custer halted the 7th Cavalry and dictated an order: “Benteen. Come On. Big Village. Be Quick. Bring Packs. P.S. Bring Packs.” The order was scribbled and handed to trumpeter John Martin, who grabbed it and galloped off in