Throughout earth's history, weapon trading has always been significant, and has altered things on a grand scale. Here's what I have in mind for the game: If a player researched Gunpowder, this allows him to build the Musketman unit, and has a stock of Niter resources. That player is in contact with a civ that is far behind in their research, and it will take them a long time to reach Gunpowder themselves, and they are in a vulnerable state. The player with Gunpowder should be able to, just like in actual history, trade these powerful weapons to those without ~ a true reflection of trade between Europeans and Indigenous peoples around the globe (one notable example would be the "Musket Wars" in New Zealand). How this would work would be that the player could trade a Musketman unit to the other player, which would perhaps spend one of their Niter resources (could be on a time limit, like 30 turns). This could also be the case for other units, like Bombard, etc... The player receiving the weapons would not be able to build their own until they researched the technology themselves, however using these new units could give them boosts for researching it themselves later. This could carry on through the ages of the game with quite a few different units. This would help players who have fallen behind to remain independent, and to be able to defend themselves against more powerful forces. It would also allow them to gain the upper hand over civs who are also behind in tech, and just like in real history, they could war against the others with a significant new advantage. What are your thoughts on this? And do you have additional ideas for this? Personally I feel it would add realism to the game, but also provide means for those falling behind in technology.