jan 1, 3700 BC - Mass graves at Tell Brak in Syria.

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https://en.wikipedia.org/wiki/Tell_Brak

Ferguson, R. Brian (2013). "Prehistory of War and Peace in Europe and the Near East". In Fry, Douglas P. (ed.). War, Peace, and Human Nature: The Convergence of Evolutionary and Cultural Views. Oxford University Press. ISBN 978-0-19-985900-9. p. 220

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