Standard Oil backed Bolivia which at that time owned more of the Chaco than it does now. Shell was on Paraguay's side. Even though Bolivia had a large army the highland native soldiers did poorly on the Chaco where the fighting conditions favored the Paraguayan forces. Bolivia suffered heavy losses, in troops pride and land when it lost the war and had to cede 225,00 sq km to Paraguay
No oil was found in the Gran Chaco.
