Age of Empires Series Wiki
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Infantry armed with firearms have their attack increased.
—In-game description

Paper Cartridge is a technology in Age of Empires III that can be researched by European civilizations at the Arsenal once the "Advanced Arsenal" Home City Card has been sent (except for the Swedes); the Japanese can also research it at the Golden Pavilion wonder. Once researched, it increases the attack of gunpowder infantry by 15%.

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