Observations

Basically, this thread is for the collection of of small tips and tricks which you can't post anywhere and don't deserve the thread of their own. I will embed them in spoilers if I get more. I myself made an observation -

1. Your income in army group = 2 (Total income)

For example, if you have 5 cities, each producing 2 coins, then your total income would be -

2(2 + 2 + 2 + 2 + 2) = 2(10) = 20. It's basically double of your total income.