Playing Cossacks: Back to War, and going through the last part of the tutorial. I'm at the part where I need to research the ability to build gates at the academy, but when I go to make my peasants gather stone, the stone resources disappear. I have a great amount of my peasants gathering stone, but the most it gets up to is like 600 before it depletes again. Am I missing something?


EDIT: Apparently walls have upkeep. Sorry!