STAR-TELEGRAM STAFF WRITER FORT WORTH - In the back of an oak-shaded cemetery behind the county hospital flies a Confederate battle flag, carved into the massive Samuels family headstone. Jacob Samuels, at his death in 1906 at the age of 70, had not forgotten that he rode with Waller's Texas Cavalry during the Civil War, that he had fought and nearly died in Louisiana for the Confederacy. Not far from Samuels' grave are the graves of three other Civil War veterans, two of whom - Phillip W. Greenwall and Solomon Kahn -- proudly wore the gray of the Confederate army....