Iron smelters can be build on unused plains. They smelt iron ore to iron bars, that are used for the construction of building or to outfit armies and spies. The sufficient supply with coal should be guaranteed. You may give iron smelters a higher priority as compared to armouries in the stock.
*The provided construction time does not take the research areas "Fatigue Duty" and "Industrial Cooperative" into account!
The cancellation of construction orders is possible at any time. 90 % of the paid ressources are returned.
Hints by experienced players
The production of iron bars is enormously important - from beginning to the end of the game. Iron bars are generally the most expensive building material in the market.