The s_mountains.zip file you have requested: Maps / Multiplayer / Bunny's Mountains - 386.37kb is not available. Perhaps try browsing all files for the game Battle for Middle-earth and upload any files you want to share or are missing. This is the only information we could locate:
A uniquely setup map that allows for various combinations (e.g. 3 castles vs 4 camps or 3 castles vs 2 camps + 2 free camps, etc.).