Replying...
Intro. Before the creation of the ninja villages, the world was at constant war, dominated by mercenary clans hired to fight. . . . . . . The two strongest rival tribes were: . . . . . . Senju clan – known for their balance, strength and desire for peace. . . . . . . Uchiha Clan – Sharingan masters are proud and strong, but driven by emotion and revenge. . . . . . . These tribes fought endlessly, always hired by opposing sides, fueling a cycle of hatred and death that spanned generations. . . . . . . It was in this environment that Hashirama Senju and Madara Uchiha were born—two boys who became secret friends and dreamed of a peaceful world. . . . . . . . . . But when they grew up and became leaders of their tribes, they ended up fighting each other, despite Hashirama's efforts to form an alliance. . . .

Alliance between Uchiha and Senjus.

@payam