The Two Fortresses is a 6 player skirmish map. 3 players start in each fortress.
V2.0 I deleted some objects that were in the original post that were making the game shut down after the map loads. I also added a night and day cycle and ring heroes. You can walk on the docks on the lake and I think that all of the textures are blended.
V3.0 The sides of the gates are impassible so you can not walk through them. The gate owned by player six is open at the start of the game so their units can exit the fortress. I added new creep units and ruined towers.