The work in particular, just to give a clue that will help noone, was about the collapse of feudalism, and the part that I am thinking of in particular was talking about the formation of the absolute monarchy, and how contrary to popular myths, gunpowder wasn't necessary in the destruction of the nobility. Rather the use of debt to buy them out forcing the freeing of the serfs in exchange for money payments, and how even before gunpowder, pikes and trebuchets were doing in the knights and castle-bound nobility...