Smokeybear
Emperor
You should really ramp up the difficulty playin it on too easy makes it boring as there is not really any chalenge at all.
Seriously. I never played any Civ game in my life, until buying Civ 5- and I started out on Prince and have moved up to King, which still keeps me challenged at times with the improvements from the last patch or two. I can't imagine playing the game and being remotely challenged or entertained on *Chieftain*. Not being snobby, just a fact. That difficutly is CoT- Civ on Trainingwheels. If you are having issues with getting DoW'ed too much at that difficulty level, you need to read and research more of the good posts on this forum about how to better understand and utilize the Diplomacy functions.
Once you learn more about how to play the opposing civ's diplomacy to your benefit, then you should be more comfortable moving on to higher (and much more fun) difficulties.