Plate Mail Armor is a Blacksmith technology. Infantry +1 melee/+2 pierce armor.
- Building: Blacksmith
- Age: Imperial Age
- Cost: 300 food, 150 gold
- Research time: 70 seconds
- Available to: 45 of 56 civilizations (11 do not have it).
The Imperial Age infantry armour upgrade, with the extra pierce armour that helps infantry against archers.
Figures from the game data for Update 185872 (September 2026), at the time of publishing.