Durham University-led researchers say that genetic evidence from 34 skeletons dating back to around 5000 B.C. shows the deaths were the result of a tribal war over the need for female companionship.
While adult females were found among the immigrant skeletons, only men and children were found among the native group of skeletons buried in the village of Talheim. The lack of local females, the researchers said, shows that they were captured instead -- a possible primary motivation for the attack.
Must read that paper. This was also interesting to me:
German skeletal experts first suspected the deliberateness of the prehistoric attack after determining that a blow to the left side of the head killed most of the victims. This suggested the victims were bound and killed, probably with a stone axe.