METALLURGY casts barrels strong enough for heavy guns.
Allows the CANNON.
The cannon retires the CATAPULT and restores the attacker's advantage against walls that muskets could not shake.
Civilization Advance
Metallurgy
Data
- Requires
- Gunpowder, University
- Allows
- Steel (with Industrialization)
Electricity (with Magnetism)
Cannon unit