Chaco War
September 9, 1932 – June 12, 1935 · Gran Chaco
Result Paraguayan victory
War between Bolivia and Paraguay over the Gran Chaco, the bloodiest South American war of the 20th century; Paraguay won most of the disputed region.
Paraguay
Bolivia
Other
Strength and losses
- Strength
- 150,000
- Killed
- 35,000–50,000
- Captured
- 2,556
Paraguay Killed c. 36,000
- Strength
- 210,000
- Killed
- 50,000–80,000
- Wounded
- 40,000
- Captured
- 21,000
Bolivia Killed c. 56,661
- Killed
- c. 92,661
Battles 1
- Battle of Boquerón (1932) September 7–29, 1932 · Paraguayan victory