Today in History–July 31–the Library of Congress features Civil War General George H. Thomas, born on this date in 1816. Although he was born in Virginia, Thomas allied with the Union in the Civil War. Thomas’ 1863 defense of Chickamauga Creek in northwestern Georgia led to the moniker the “Rock of Chickamauga”. The following year he played a key role in the siege of Atlanta under Union General William T. Sherman. Learn more about this West Point military man by visiting the Today in History section and clicking the links below.