This is an upgraded version of my gm_npcwarzone. The map has buttons you can use to spawn npcs. I think its a big change as you will notice there is now a second floor you can reach via teleport. Also I highly recommend that you don't have keep corpses on, it will lag. Also, another way to prevent lag on this map is with this addon:
http://www.garrysmod.org/downloads/?a=view&id=29053
Well, I hope you enjoy. A lot of work went into this map, I ensure you more versions will arise soon.