Smashed skulls suggest large European battle 3,200 years ago - and a more advanced society - The Washington Post

https://www.washingtonpost.com/national/health-science/dig-reveals-an-event-so-violent-that-its-participants-must-have-been-civilized/2016/03/31/64cc6968-f6ba-11e5-9804-537defcc3cf6_story.html?tid=a_inl