In spite of the fact that the Bolivian army had more manpower , it never mobilized more than 60,000 men .
Never more than two - thirds of the army were on the Chaco at any one time .
In spite of the fact that the Bolivian army had more manpower , it never mobilized more than 60,000 men , and never more than two - thirds of the army were on the Chaco at any one time .