So you're playing a peaceful game but things are getting a little boring making buildings and maybe your economic dominance has you hitting a wall anyway with not much left to build. Going on a mini conquering spree is going to throw your carefully balanced tall empire out of whack so that simply won't do. You need a sucker -- somebody you can rough up with little risk to you. Prime Candidate: 1. Neighbor. 2. Has been an unbalanced to you all game and you just can't get a profitable trade going with him. 3. Hates one of his other neighbors. 4. You are friends with that other neighbor. 5. That other neighbor has a stronger military than you. The real idea is to just attack someone when he's in a serious war with someone else. If you're just bored, try to get a neighbor powerhouse to declare on him and start in a few turns later. While he's distracted fighting the other guy send in a couple cavalry on a pillage spree. I've seen pillage values as high as 40 gold per improvement. If you're really on a tear this actually can set the AI back just enough to give you breathing room later when you're on a heavy build push. And the magical hidden super happy bonus... Stalemated wars where you just push forces back usually only end in neutral peace deals. This can be the tiny push necessary to broker a favorable peace deal where you will make money and/or resources. $$$!!!!! All in all it's a good way for tall empires with a few spare hammers to make money off of uncooperative AIs while having a bit of fun in the process.