I agree the medieval period is the best setting for a TW game . The technical advances for example runs from iron mail armour right trough to full plate steal then there's the introdction of the crossbow and its development into a long range armour weapon. fortifacations start as mere earth works and timber baracades to massive stone fortresess and the development of siege engines used to breach them with the eventual introduction of gun powder.All this set on the back ground of the medieval power struggle wich resulted in hundreds of years of warfare. I cant think of a period more suited to a TW game .