From the last episode of Naruto Shippuden Manga Series, the first meeting of Hashirama and Madara. So it turns out that they both share this wishful dream a possibility of changing their twisted worlds. They meet up from time to time just to practice and hound there skills. They talk about there dreams about building a peaceful village where kids can play and not face the terror that they have now on the battlefield even without telling there last name. Until one day Tobirama the brother of Hashirama and his father told Hashirama about Madara being one of the Uchiha clan and asked him to get as much info on the Uchiha's. As they meet again and as there common greetings to each other they skip stones and on that stone a message telling Hashirama that it is a trap and Madara to Run. Then Tobirama and his father showed up and also the Uchiha's.
TheNaruto Shippuden Manga entitled 623 A Glimpseis quite a sad episode for me just as Hashirama and Madara find there own dreams and share it with each other to change the world where they are right now. But both clans are fighting and it appears that this will conclude and test there friendship.