City Wall is one of the two rewards you can choose after you have upgraded a level 2 city to level 3 (the other being Resources). If you choose City Wall, your city will gain a wall visual on the bottom. It grants a x4 defense bonus to any units inside. Enemy units in your city are not affected. This does not stack with the x1.5 buff that being in a city gives you.

Units in cities with walls will have a double shield appear around their health.

Statistics Edit

Warrior Rider Archer Defender Swordman Catapult Knight Giant (Super unit)
Normal defense 2 1 1 3 3 0 1 4
Defense in city without City Wall 3 1.5 1.5 4.5 4.5 0 1.5 6
Defense in city with City Wall 8 4 4 12 12 0 4 16
City Upgrades
Border Growth, City Wall, Explorer, Park, Population, Population Growth, Stars, Super Unit, Workshop