World Wonder: Great Wall
Tech Required: Engineering
Production Cost: 250
What it Does: Enemy land Units expend +1 Movement inside your territory. Provides a Free Wall in the City in which it's built. +1 Culture, +1 Great Engineer Point. The Great Wall's movement effects become obsolete with Dynamite, while the Culture and Great Engineer points continue.
Strategies
This can definitely help a peaceful Civ to protect itself from invasion. Melee Units will only get to move one hex per turn, so it takes longer for them to surround a City. Against an AI, I find the Great Wall to be pretty frustrating if the enemy has a decent Army. You need more forces ready to move forward and expect some losses if they have good ranged to hit you as you advance. I rarely build it but it's definitely something I'll consider now that the AI will be more aggressive against Civs with smaller Militaries with the Fall Patch of 2013.
The Great Wall will outline the full border available from the City in which it's built and can look quite impressive if there are no gaps in your Civilization's territory. Regardless, if you build this, it will provide the effects inside your territory, not just the place where the wall has been drawn on the game's map.
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