TECHNOLOGY · AGE OF EMPIRES II
Spies
Reveals enemy civilian units and their current Line of Sight after research. Its gold cost scales with the number of enemy civilian units, making timing and match state important.

Overview
Reveals enemy civilian units and their current Line of Sight after research. Its gold cost scales with the number of enemy civilian units, making timing and match state important.
Effect and affected units
Spies changes reveals enemy civilian units and their Line of Sight. Read the named target carefully: this effect applies only to the units, buildings, or economy described in its entry. This is the main reason to research it; compare the affected units with the army you expect to field.
Research cost and timing
Research is available in Age of Empires II at the Castle. The recorded cost is Gold cost scales with enemy civilian units, and the research time is not separately recorded. Consider whether the upgrade will affect enough units or workers to repay that investment before the match is decided.
Effect and research timing
Reveals enemy civilian units and their current Line of Sight after research. Its gold cost scales with the number of enemy civilian units, making timing and match state important. Effect: Reveals enemy civilian units and their Line of Sight. Research at: Castle; Research cost: Gold cost scales with enemy civilian units. Its value depends on which units receive the effect and how often they take part in combat; timing it before a major engagement can improve the whole eligible group.
Research details
- Status
- Available
- Research age
- Imperial Age
- Research building
- Castle
- Effect
- Reveals enemy civilian units and their Line of Sight
Research requirements and effects for this entry.
- Also known as
- spies · Spies (Age of Empires II)
- Focus
- Available
- Signature / category
- Research
- Release / context
- Age of Empires II
- Region
- Age of Empires II
- Classification
- Technology