The Fortress Age if the third age (after the Colonial Age) in Age of Empires III. It is characterised by the beginning of fortification in the civilization's colony, the beginning of artillery, and the improvements of the economy. Many more military units are avaliable in the Fortress Age including the Falconet. To advance to the Fortress Age you need to have 1200 Food and 1000 Coin.
- Units and Buildings which become available in the Fortress Age
- Arsenal
- Fort - All infantry, cavalry, and artillery except the mortar units are avaliable
- Plantation
The Fortress Age is followed by the Industrial Age.