question: What is a rare survivor on the David and Catherine Driver Farm from American Civil War campaign led by American soldier, businessman, educator, and author William Tecumseh Sherman?
answer: 1839 barn
context: Title: David and Catherine Driver Farm
  Passage: The David and Catherine Driver Farm is a historic farmstead in rural Rockingham County, Virginia, near Timberville.  The main house, a 2.5 story wood frame structure, was built c. 1845 and has Greek Revival styling.  It was extended in the 1880s, giving it a T-shape and adding Victorian details such as bull's eye window in the front gable.  The farm's most notable building is a c. 1839 barn, a rare survivor of the American Civil War campaign of Union Army General William Tecumseh Sherman through the area, in which most barns were destroyed.
  Title: William Tecumseh Sherman
  Passage: William Tecumseh Sherman (February 8, 1820 – February 14, 1891) was an American soldier, businessman, educator, and author.  He served as a general in the Union Army during the American Civil War (1861–65), for which he received recognition for his outstanding command of military strategy as well as criticism for the harshness of the "scorched earth" policies he implemented in conducting total war against the Confederate States.
  Title: Sherman's March to the Sea
  Passage: Sherman's March to the Sea, more formally known as the Savannah Campaign, was a military campaign of the American Civil War conducted through Georgia from November 15 to December 21, 1864 by Maj. Gen. William Tecumseh Sherman of the Union Army.  The campaign began with Sherman's troops leaving the captured city of Atlanta on November 15 and ended with the capture of the port of Savannah on December 21.  His forces destroyed military targets as well as industry, infrastructure, and civilian property and disrupted the Confederacy's economy and its transportation networks.  Sherman's bold move of operating deep within enemy territory and without supply lines is considered to be one of the major achievements of the war.
citations: David and Catherine Driver Farm William Tecumseh Sherman