These three ancient lakes are the only source of fresh water on the entire continent, so peaceful coexistence among 18 civilizations is highly unlikely. Local leaders understand the simple truth: if you want your people to prosper destroy the others.
I used Community Patch (global modification of AI and bug fix) https://forums.civfanatics.com/forums... for this battle.
Music: Akira Senju Fanfare for the Brave, Shiro Sagisu Invasion, Tachibana Asami Escape