The story of the Callahan Expedition has slept in a dusty corner of Texas Ranger history for over 160 years . Until now, until this novel-A Different Country Entirely.In 1855, across the southwest edge of Texas, settlers live in daily fear of the savage raids by Apache warriors. After their depredations, the Apaches outrun their pursuers to cross the Rio Grande River to the safe haven of Mexico, where the U.S. Army and the Texas Rangers are forbidden.In...