Ok, how about this:
A sticky thread, much like the current one regarding recruitment, where each guild leader may post a single message on the thread with two (or more) sections concerning war status? Something like:
BLAHBLAH GUILD WAR STATUS
Currently At War With: guild1, guild2
Currently Allied With: guild3, guild4, guild5
Sound like a good idea? Of course it\'d be strictly moderated like the other one, so no war discussion will be held there. It may also be a good idea if posts contained a link to the guild\'s forums where people may go if they do want to start trouble.
Edit: Oh, and then you\'d just announce that \"our guild war status has changed\" in your normal guild thread, and then people will know to look at the Guild War Status thread to update themselves.