Military activity is not the only kind of violence. I think evidence of military activity would involve obvious weapons and armor, which have generally been ea

Military activity is not the only kind of violence. I think evidence of military activity would involve obvious weapons and armor, which have generally been easy to recognize and easy to distinguish from e.g. hunting or ranching equipment. The paper linked notes a prevalence of head trauma, presumably with clubs. It doesn't suggest to me any pattern like religious sacrifice or criminal execution. So, the nature of the violence is hard to discern.