Battle of Acosta Ñu: A Paraguayan battalion largely made up of children is massacred by the Brazilian Army during the Paraguayan War.

The Battle of Acosta Ñu, also known as the Children's Battle in Paraguay and the Battle of Campo Grande in Brazil, took place on 16 August 1869. It was the last major engagement of the Paraguayan War between the Triple Alliance and Paraguay. The 3,500 poorly armed Paraguayans, mostly boys between nine and fifteen years old, old men and wounded combatants, confronted 20,000 Brazilian and Argentine veteran soldiers.