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This article is about the technology in Age of Empires III. For other uses of the term, see Spies.

You can see everything your enemies can see!
—In-game description
Your spies have been sent out to watch enemy positions.
—Message once Spies is researched
[Player name] has sent out spies.
—Message when an ally has researched Spies
[Player name] has infiltrated your ranks with spies and now knows all that you do.
—Message when an enemy has researched Spies

Spies is a technology in Age of Empires III that can be researched at the Capitol or State Capitol by European and Federal American civilizations or the Town Center once the Imperial Age is reached by Native American, Asian, and African civilizations. Once researched, it allows the player to see their enemies' Line of Sight.

As with its Age of Empires II version and similar to Blockade, Spies have a variable cost that depends on how many units that non-defeated enemies have, but with no minimum or maximum limit.

In a team game, only the players who researched the upgrade can see the enemy's line of sight, it is not shared with teammates.

Except if the starting age is set to Imperial/Post-Imperial Age, Spies is unavailable in Deathmatch as players cannot advance into the Imperial Age.

See also[]

Capitol technologies
Blockade · Spies · Knighthood · Peerage · Legendary Native Warriors · Immigrants · Large Scale Agriculture · Deforestation · Excessive Taxation · Cadets · Brigadier General
State Capitol technologies
Age III tech tree aoe3
Oregon Trail · State Constitutions · Statehood
Age IV tech tree aoe 3
Cadets · New Mexico Immigration
Imperial Age
Blockade · Spies · Brigadier General · Legendary Native Warriors · Iowa Farmlands · Pine Tree State · Mountain State Gold Rush
Other civilization's counterparts
AfricanLarge Scale Farming · Ebony Exports · Strangers' Quarters
AsianMechanized Rice Cultivation · Tropical Timber Trade · Collective Economy · Exalted Natives
Native AmericanLarge Scale Gathering · Deforestation · Excessive Tribute · Legendary Native Warriors