8 million Wood Elves from Total War: Warhammer vs Brazilian and Indian armies. Who will win?

There will be 4 million Wood Elves in the Brazilian Amazon and another 4 million in the Indian forests.

They will attack humans who enter the forest to do something like cut down trees, hunt animals, or whatever. They will expand the forest area, causing them to clash with the armies of both countries.

Who will win this fight and what will the consequences be?