Guarani was widely spoken among the soldiers .
Guarani was widely was used per order of Jose Felix Estigarribia in Paraguayan military communications during the Chaco War in order to make them harder for Bolivians to decode .
Guarani was widely spoken among the soldiers and was used per order of Jose Felix Estigarribia in Paraguayan military communications during the Chaco War in order to make them harder for Bolivians to decode .