I had the thought to make a map around the idea of fog of war, but without making it a "forest" map like the campaign maps that introfuce the concept to you. The idea I settled on was a map based around narrow passages through the mountains - you can climb up on them to get a better view and set up an ambush on anything traveling down the road at the same time! The long, narrow pathways closely hemmed by mountains make the map very cramped, so to succeed here you need to know when to back off and take another path to one of the isolated open areas rather than continuing to throw forces into a sealed chokepoint.
