Perhaps the most intra-humanity project to be undertaken, there are many approaches to this – from mediation to the marrying off of the local princess to the king next door. In Iraq, the weak central government has resulted in the revival of the ancient conflict resolution practice of fasliya, as reported by AL Monitor‘s Omar al-Jaffal:
Women took to the streets of al-Mutanabbi Street in central Baghdad June 2, holding large banners denouncing fasliya marriage — the Arabic word for marriages arranged as compensation, through which tribal conflicts are resolved — which has surfaced in Iraq anew. …
Women who have been placed in a fasliya marriage are not entitled to file for divorce or separation because, according to tribal customs, they are stripped away of any rights.
An example:
… saying in a statement to al-Sumaria channel that a crisis broke out between two large tribes in Basra over the death of a woman during an armed conflict between both tribes. Therefore, al-Shawi tribe presented 10 women — not 50 as the media claimed according to al-Maryani — to al-Karamsha tribe for fasliya. The two tribes refused to talk to the media about the incident, claiming it was a personal affair.
According to the report, this appears to be a tribal custom, confined to the rural areas; it had been banned by the Iraqi government in the 1950s, but with the dissolution of the strong central government by the American invasion, it has been gradually reappearing in the absence of other mechanisms – or coercion from Baghdad. I don’t know much about the social dynamics of Iraqi tribes, so I can’t really hazard a guess as to why this works for them. My lovely Arts Editor suggests that marriage gives the two tribes a family link, and therefore they have to stop fighting – but I’m not sure that’s how it works.