Age of Empires Series Wiki
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A Bombard Tower and a Keep behind a wall in Age of Empires II: Definitive Edition.

Defensive structure is a type of building available in every game of the Age of Empires series. Rather than be used to train units or research technologies, they are used to defend their civilization from attacks, or warn it of attacks.

Generally speaking, there are three types of defensive structures: walls, towers, and Castle-type buildings.

In Age of Empires II, Age of Empires III, and Age of Mythology, Town Centers get an attack of their own that can be improved by garrisoning Villagers or Archers and double as defensive structures as a result, even though their primary function is economic.

Age of Empires[]

All defensive structures are researched and upgraded from the Granary:

Towers found in campaigns and in the Scenario Editor:

Civilization bonuses[]

Age of Empires II[]

Constructable[]

Unconstructable[]

The unconstructable defensive structures can only be found in campaigns and in the Scenario Editor:

Civilization bonuses[]

Team bonuses[]

Unique technologies[]

Age of Mythology[]

All defensive structures (except for fully upgraded walls) can research technologies that upgrade themselves. Towers can also research technologies that improve building Line of Sight.

Age of Empires III[]

Age of Empires IV[]

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