Takes place where Aang and Ozai fought. To death. All at avatar state. 1st Hokage at his most powerful.
We haven't seen enough of the First Hokage to know what he can do beside from what we heard about him. The first naruto series of the Hashirama strength has been is retcon. So it is uncertain to what he can really do. Which is why I want to see the fight between him and Madara....Or at least use that perfect clone of Hashirama that is stuck inside the tree were the ten tails beats was atsSo we can know what he can do.