Armories are constructed on unused plains. They forge weapons for your armies from iron bars and coals. There is no distinction between the weapons needed for the various army units, but some units require less weapons for successfull training.
Similar to paddocks a armoury can be deactivated (and reactivated) at any time to reduce the consumption of coal and iron bars, if needed. The number of weapons produced in an armoury does not depend on the population level of the field.
*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
Start early with the construction of armouries on plains with low fertility. Weapons can not be bought and the ressources provided at the start of the game don't last long, if you want to expand unhindered.