The war_in_the_ring_ins.zip file you have requested: Maps / Multiplayer / War in the ring - 282.52kb 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:
The two bases in this map are directly outside of a Ring with only 2 entrances. To get to the other base you need to past through the Ring and because of that you may in some cases even fight inside the Ring.