Second Battle of Nanawa
1933 CE.
Shown on the map at -23.458°, -59.722°.
The Second Battle of Nanawa was fought from the 4 to 9 July 1933, between the Bolivian and Paraguayan armies during the Chaco War. It was one of the bloodiest battles fought in South America in the 20th century, coming to be labeled as the "South American Verdun" by comparison with the Battle of Verdun of World War I.
Text from the Wikipedia article Second Battle of Nanawa, licensed CC BY-SA 4.0.