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The Horsemen by Gary McCarthy, 1st in his Horseman series of post-Civil War western adventure series, this installment originally out from Diamond Books in 1992. The cover blurb says that the author is a Western Writers of America Spur Award winner.
After the Civil War devastates their home, the Ballous, a Tennessee horsebreeding family, relocate and start anew in the West where their new neighbors could become lasting friends or tomahawk-toting enemies. Another fine action adventure western from one of America's finest historians and authors...and a horse lover.