I think this game is called War Planet Online: Global Conquest. I downloaded it for free from the play store. It has in-app purchases.
I was about to call it Warcraft or something. LOL.
I have played it for a very long time. Much like I have played the mods for Civ 4 for a very long time.
I wish the combat was quicker in Civ 4 and Civ 5. I haven’t downloaded Civ 6 because I want to save money for a rainy day.