Two opposing forces coming together, do you think it was at that time Madara figured out that by fusing Hashirama's cells with himself he can gain new strength?
Hashirama's point of this whole flashback is to clear up some things for Sasuke, like the fact that the village ended a long era of fighting between the two clans and stopped the bloodshed of children but I wonder what will Sasuke's take be on all this....
