Each battle takes place in one of the districts of Mordheim circled on the map. At the start of the campaign, warbands arrive from surrounding encampments, entering via one of the gates of Mordheim (see points of interest on the map).
New Players starting their first game must battle at one of the gates, with the new player deciding the gate. If both players are new, roll off to decide.
Subsequent battles can only take place in a district that can be reached by at least one of the warbands. This warband must be able to connect a path from any gate to the district the battle is in, via the districts they have already explored.
Opponents should agree on which district to battle over, if they cannot, they should each propose one district which they can reach and roll-off to decide. Players can determine the location ahead of time, so any thematic terrain can be arranged/prepared.
Players who have fought in a district are considered to have explored that district, and can now reach its neighbouring districts. The Moderator will mark the map to show which warbands have explored which district.