Age of Empires Series Wiki
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Age of Empires Series Wiki

British infantry hitpoints increased but march more slowly.
—In-game description

Thin Red Line is a technology in Age of Empires III that is unique to the British and can be researched at the Church once the The Glorious Revolution Home City Card has been sent. Once researched, it increases the hit points of all infantry by 20% but reduces their speed by 25%.

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