War Happiness work!! It is opposite to War Weariness that discribed in http://www.civfanatics.com/civ3/strategy/war_weariness.php My findings are that you will not get happiness when AI declare due to their MA or MPP. It is rounded down first and than added from each happy war. Thus, if you have 7 citizens and are getting happiness from two declarations, you will get 2 happy faces. (7 * .25 rounded down = 1, * 2) If you have 8 citizens and are getting happiness from two declarations, you will get 4 happy faces. (8 * .25 rounded down = 2, * 2) This effect of WH is permanent and if after long peace you declare war again war happiness will return. Additional benefit is that Human will get rid of gpt payment deal and reputation will be preserved. Now the question is how to make happy war? 1) Do not cave to demands. 2) Ask Remove or Declare. This trick may help: if AI goes somewhere else through your land, surround (block) their troops and tell them Remove or Declare. Normally, the second or third demand will work. 3) Make an agreement (Military Alliance (MA), for instance) that include peace treaty. When AI break Alliance they automatically declare war and WH Drawback of 1): Nobody knows when AI will ask for tribute. It may happen in sudden and you may not ready for war. And if you are ready AI will not declare. Drawback of 2): The same as 1): Who knows when AI will come? And if they come after you and declare you will face a real war and WW will come soon. Mode 3) is much better, because WH may come via phony war that does not causes WW. To make it work faster better to have many MAs. Probability that one out of many will be broken is higher, than just one MA. Ideal situation for that was at GOTM 70 (Spain) where bunch of AIs sit on remote continent and MA with half of AIs against another half causes mutual WH very soon. If, for some reason AI stays at MA(s) 20 turns it is essential to renegotiate peace treaty deal when it expire. Otherwise AI popup IBT and will offer plain peace treaty without any add-ons. At pop-up mode it is impossible to make any deal. Rejection of peace as it is will cause a war without WH and reputation will trash. Obviously 3) also does not guaranty WH. Additional drawbacks of 3) might be also considered. (i) If you bring AI at too many wars and cant help him and AI will be killed while in treaty your reputation will gone. (ii) If you kill your common enemy you come to the situation of war with your former friend without his declaration. This war will not cause WH and your reputation also gone. This bug (feature (?)) specific for MA + peace deal only. Other MA + trade deals will not trash reputation if you kill common enemy. (iii) It is interesting to test how trade + peace treaty works. Obviously if you break trade route reputation gone and no WH will appear. More difficult question what if it happen IBT? I mean third party break trade route IBT. Also, IF to brake MA IBT (via big picture)? It will trash MA reputation but will it cause WH? Certainly it is open area to research. Acknowledgements to Automated Teller for polishing English. Automated Teller suggestions for happy wars: My memory says that 4) will not generate WH, but I may be wrong.