The Siege Factory is a military building, where siege/artillery units and Supply Wagons are built. It becomes available in the Classical Age, once Military Level 2 (Mercenaries) is researched. It requires both Timber and Metal to be constructed.
Types of units built at the Factory:
When a nation enters the Industrial Age, all Siege Factories are automatically upgraded to Factories. Most of the stats remain the same but for some reason, the base cost changes to 120 Timber which is the same as the Barracks and Stables/Auto Plants. Factories also gain the ability to create and upgrade anti-aircaft units, to counter the rising threat of aircraft raids.
Being a military structure, it may be built anywhere within friendly (own or allied) borders. The ramping cost is doubled for every three buildings of the same type, whether existing or under construction.
Siege Factories may be garrisoned by all types of units they create. Garrisoned units are safe from taking damage and are slowly repaired in the Siege Factory if they are Siege Factory units. The maximum garrison capacity is 20, with siege/artillery units taking up 2 slots each.
If Advanced Options are turned on, a button will show up in the Factory's control panel, allowing to enable or disable the Auto Deploy stance for newly created artillery units. It has no effect on garrisoned units ejected from the building.
- The Turks receive two free artillery units whenever completing a Siege Factory. Their artillery is also upgraded immediately and for free, when technology requirements are met.
- The French receive a free Supply Wagon when they complete a Siege Factory. Note that this allows the French to have Supply Wagons during the Classical Age, while all other nations have to wait until the Medieval Age. Also, French Supply Wagons heal your units within their radius, and French Siege Factory units move 25% faster.
- For the Indians, most buildings do not rise in cost, including the Siege Factory.
- The Lakota may build Siege Factories (and other military structures) in neutral territory as well.