I tried this strategy as Japan and after failing miserably I jumped on the opportunity to complain about unit supply in an extremely tall empire and how the strategy is currently completely irrelevant. Before writing any more about the subject, I wanted to try and give myself the best possible chance at executing it. I needed a Civ that can take cities no matter what his start, can conquer extremely early and have the strategy actually play into his overall theme. Guesses anyone? My settings were: Tiny, Emperor, Doughnut (center ocean), Assyria, Quick In my first game I was bordering authority Ottomans and tradition Inca. Thinking it's best to attack my weakest neighbor first, I attacked the Incas. I didn't have any iron, but regardless I was easily winning and took my first city. Unit supply was never a problem. In fact at one point I preferred building buildings instead of making more units even when I had the supply for them. After acquiring iron and some more conquering, me and Inca eventually settled into him becoming my vassal. By this point (~industrial era) the Ottomans were big and mighty. There was no challenging them. On one of my saves I tried attacking when he was in the middle of warring with far off Mongolia. I took one of his cites, but when his war machine finally arrived the sheer size of it convinced me there was no way. On other save I tried completing my conquering of the Incas. I was met with the same fate. Looking back the game seemed very winnable. I should have gone statecraft and not artistry, and maybe I should've attacked first the Ottomans and not the Incas. In my second game I was neighboring with authority Byzantine and Korea. After building Terrocata Army and Great Wall, once again unit supply was never an issue and I even had a sizeable surplus. On one save I tried attacking Korea, but naturally his sword men (and overall his army) were much stronger than mine. So on another save I went for the weaker Byzantine. I took one of her cities, and after seeing she had war elephants and my army was already in a pretty bad shape, I accepted peace. Meanwhile Korea was settling very aggressively. I thought to myself if I could manage to take some of his fresh cities (and his techs) that could put me in a situation to snowball this entire game. While preparing for war, he demanded horses from me, and I demanded he not demand horses or anything else for that matter, and so it began. There seemed to be glimmers of hope throughout, but an enormous technological lead with a much superior navy and army (especially numerically) meant only one thing. But the game still seemed winnable with overall better decision making. I think if I played both games on standard speed I would have probably won. TL;DR: Looking back my primary problems were not unit supply but mainly national wonders and upgrading units. National wonders - they come very delayed if at all due to the citizen number requirement. Upgrading units - even after conquering and puppeting there still isn't enough gold, even when selling off all my luxury resources and never investing.