Chain Mail Armor is a Blacksmith technology. Infantry +1 melee/+1 pierce armor.
- Building: Blacksmith
- Age: Castle Age
- Cost: 200 food, 100 gold
- Research time: 55 seconds
- Available to: 55 of 56 civilizations. Missing for: Tatars.
The Castle Age infantry armour upgrade.
Figures from the game data for Update 185872 (September 2026), at the time of publishing.