I'm playing as Russia in multiplayer (vanilla civ 6) and have Japan as my closest neighbor. My friend is in the ancient era - and based on his sci/turn, probably about 15 turns away from being able to build Samurai, which will probably take another 10-15 turns to build and mobilize. I don't have any iron, but I could mine one if its crucial to my survival (side question - where can I find out the exact strategic resource requirement for units - most sources I look at will say for example that a horseman requires horses, but neglect to mention that it actually quires two unless you have an encampment). I'm slightly ahead in tech and making almost double the sci/turn. I'm thinking crossbowmen behind city walls. Thoughts?