The Factory is a agricultural and military building featured in Age of Empires III.
The Factory is a unique building that is available during the Industrial Age for every European civilization. The Factory is sent as a Home City shipment from the "Factory", "Robber Barons" cards, both of which will send factory wagons to construct factories. The Factory is able to generate a steady source of food, wood, coin, or heavy artillery for the player at no cost. The factory also offers upgrades to increase the production rate of whatever the factory is configured to produce and an Imperial upgrade for the civilizations heavy artillery unit. Most civilizations receive the Heavy Cannon unit, although the British receive the Rocket and the Ottomans receives the Great Bombard. They are most often placed in a well-guarded position, because they are easily destroyed by dedicated siege or a rampaging army.
It can be built by the Chinese civilization by shipping it from the Consulate with Russia as its ally. It can also be constructed by India during their single player campaign by also taking Russia as an ally.