How to upgrade war and civilization correctly? When upgrading, you can't just be quick, you can't just brush your books quickly. In this way, the later strength will be weak.

Priority should be given to upgrading barracks, blacksmiths, arms, windmills, markets, libraries, defensive mercenaries (towers, barracks walls) and so on.

Priority knight (future tank) archer (future musket) (milk truck) (crossbow gun) (horse thief) (infantry) The late infantry is of little use. I feel that I have always been a knight's gun (it is suggested that if I have to pay the novice, I will unlock the monthly card in advance, industrial farmers will speed up the building upgrade, and farmers need to buy 600 diamonds) (it is recommended that all resources go in every era)