I was watching Pathfinder, a movie about the Viking Invasion of North America, and I was thinking. It would be fun and rewarding if you attacked a village or town with that contains superior weapons or armor as a result of their culture, and just we're lucky or smart enough to defeat them by your strategy, an interesting new twist would be to to allow them to take weapons from the city.

Usually as a result of winning battles, I believe that your fighting ability goes up, so some might argue that you do get gains inherent to RTW, but this would add an exciting twist. It's just an idea, and it may be a bad one, but I think that this is how historically that some technologies were absorbed and adapted.

NL