igorvragovic said:hmmm, you could make a chained DoWs. If Mongols DoW Slavs, you write event for Slavs. If Slavs are in war against Mongols (and maybe to add that they are loosing territories), that Slavs DoW Germans. The same you write for Germans. Just, I am not sure that it will make a pusing effect. Could happen that Slavs simply dissapear in German-Mongol sandwiche.
I'm affarid that it is not possible to target specific countries (cultures) with declare_war command. I'm not aware of any workaround this problem either, CK engine is just not capable of doing that.