OpenStreetMap is a collaborative map of the world, being made on a voluntary basis, and the Data Working Group is its dispute resolution service. Edit wars and tagging conflicts are not frequent, and are often dealt with on a community basis, but when they escalate unbearably, someone calls in the DWG. The DWG operates simultaneously as a kind of police force and as the social work arm of the voluntary fire service for OpenStreetMap. I have had the honour of serving on the DWG since November 2014, and will discuss how consideration several cases of active conflict in different cities worldwide, sheds some light on the different forces at work involved in putting together a collaborative map, and the ways in which people are personally affected. The tone of the paper will owe a little to Bruno Latour's classic infrastructure detective story, "Aramis".