Chaco War; Paraguayan/Bolivian troops fight; Asuncion, Paraguay: Parama River, buildings along river; ships, boats on river; buildings on mountainside; warship; Chinese junk on river; map shows Bolivia, Paraguay; Paraguayan army officers consult map; troops line up for water; trucks carry Paraguayan troops; troops cross river; planes attack; soldiers into air raid shelter; soldiers fire cannon; shell bursts; machine guns; air attack; bombs; shell into cannon; trench warfare; machine guns; casualty on stretcher loaded into plane; walking wounded; Red Cross plane takes off;