Age of Empires Series Wiki
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Artillery hitpoints increased.
—In-game description

Professional Gunners 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; the Japanese can also research it at the Golden Pavilion wonder. Once researched, it increases the hit points of artillery by 10%.

Arsenal technologies
InfantryInfantry Breastplate · Counter Infantry Rifling · Socket Bayonet · Flint LockA · Paper CartridgeA · Military DrummersA
CavalryCavalry Cuirass · Ranged Cavalry Caracole · PillageA
ArtilleryGunner's Quadrant · Heated Shot · Professional GunnersA · TrunionA · Incendiary GrenadesG
A requires the Advanced Arsenal Home City Card
G only available to civilizations with Grenadiers
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