Once researched, the range of all units that fires a projectile increases by one point, with the exception of siege weapons and siege ships. Villagers also benefit from this upgrade as it increases their ability to gather and collect wood. The player also gains the ability to upgrade a Ballista to a Helepolis. This is the last woodworking technology available from the Market.
The discovery of inexpensive ways to make iron was as great a technological leap over bronze making as bronze was over stone. Iron surpassed bronze in every critical characteristic- hardness, strength, and the ability to hold an edge before needing to be resharpened- Plus one. Iron was much easier to acquire than were copper and tin, making it available to all cultures and for all uses. Historians consider the ability to make and use iron ore one of the distinctions between barbaric and civilized culture.