The art of war is over and it seem that I’ve won the first prize!
They were some great post by other players, here some of my favorite :
What city/cities to place your mansion or annexe.
Great guide to have a city of 400000 k of troops.

How to defend your city:

General guide by Chris soon
It’s cover pretty much everything

Guide per kingdom and a good intake on each unit of all the kingdom

Great spreadsheet with the analysis of each kingdom

Hope it’s help and happy TKOing.