A somewhat weird thing just happened in my game. I don't think it's a bug or anything like that, it's just a little strange how the game handles this situation:
I'm playing the Netherlands, whose special unit is the Swiss Mercenary, rated 1.4.1 and requiring Iron. I had no Iron, so I was importing it in order to build them. I eventually lost my Iron trade.
After Gunpowder, I starting replacing the Swiss Mercenaries with Musketmen, which are rated better at 2.4.1 and don't require Iron, but require Saltpeter, which I had. Also, their description page says they upgrade to Swiss Mercenary, which is something I never noticed before and obviously can only happen if you're playing the Netherlands. Kind of weird.
All of a sudden, I noticed that my cities are no longer allowed to build Musketmen, but are allowed to build Swiss Mercenaries! I had not lost my Saltpeter.
???
What had happened was that Iron was discovered within my borders, which allowed Swiss Mercenaries to again be built, but disallowed Musketmen. I at first didn't notice the iron because it appeared underneath a stack of units.
This is somewhat weird, since Swiss Mercenaries are earlier units than Musketmen and have lower ratings (1.4.1 versus 2.4.1) (although the Swiss Mercenary is a special unit, so there's that). Also, as an aside, my Swiss Mercenaries have not yet triggered a Golden Age, so they are still useful for that.
Just kind of a weird situation, and I'm sure the players who play on the higher levels are well aware of these kinds of things, although it is somewhat rare to have a strategic resource appear during the game, I think.
Finally, the "solution" to this "problem" was for me to simply pillage the road improvement on the Iron square so that I am again allowed to build Musketmen.
20+ years of playing this and surprises still happen, occasionally.
I'm playing the Netherlands, whose special unit is the Swiss Mercenary, rated 1.4.1 and requiring Iron. I had no Iron, so I was importing it in order to build them. I eventually lost my Iron trade.
After Gunpowder, I starting replacing the Swiss Mercenaries with Musketmen, which are rated better at 2.4.1 and don't require Iron, but require Saltpeter, which I had. Also, their description page says they upgrade to Swiss Mercenary, which is something I never noticed before and obviously can only happen if you're playing the Netherlands. Kind of weird.
All of a sudden, I noticed that my cities are no longer allowed to build Musketmen, but are allowed to build Swiss Mercenaries! I had not lost my Saltpeter.
???
What had happened was that Iron was discovered within my borders, which allowed Swiss Mercenaries to again be built, but disallowed Musketmen. I at first didn't notice the iron because it appeared underneath a stack of units.
This is somewhat weird, since Swiss Mercenaries are earlier units than Musketmen and have lower ratings (1.4.1 versus 2.4.1) (although the Swiss Mercenary is a special unit, so there's that). Also, as an aside, my Swiss Mercenaries have not yet triggered a Golden Age, so they are still useful for that.
Just kind of a weird situation, and I'm sure the players who play on the higher levels are well aware of these kinds of things, although it is somewhat rare to have a strategic resource appear during the game, I think.
Finally, the "solution" to this "problem" was for me to simply pillage the road improvement on the Iron square so that I am again allowed to build Musketmen.
20+ years of playing this and surprises still happen, occasionally.