DescriptionCleburne's Repulse of Sherman at Missionary Ridge.jpg
Cleburne's repulse of Sherman's attack at Missionary Ridge, part of the Battles for Chattanooga.
According to the explanation given at https://archive.org/details/battlefieldsindi00nash, the book from which this image is taken was published in 1923 with a copyright, but that there is no evidence of copyright renewal with the Stanford Copyright Renewal Database. Book is considered and published by the University of Illinois at Urbana-Champaign as "public domain."
This work is in the public domain because it was published in the United States between 1929 and 1963, and although there may or may not have been a copyright notice, the copyright was not renewed. For further explanation, see Commons:Hirtle chart and the copyright renewal logs. Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.