A re-analysis of more than 300 sets of 5,000-year-old skeletal remains excavated from a site in Spain suggests that many of the individuals may have been casualties of the earliest period of warfare in Europe, occurring over 1,000 years before the previous earliest known larger-scale conflict in the region...Teresa Fernández‑Crespo and colleagues re-examined the skeletal remains of 338 individuals for evidence of healed and unhealed injuries. All the remains were from a single mass burial site in a shallow cave in the Rioja Alavesa region of northern Spain, radiocarbon dated to between 5,400 and 5,000 years ago. 52 flint arrowheads...