The Great General & Citadels
Great Generals are earned as your Land Military gains experience through combat. Certain leaders, like Wu Xetian of China earn Great Generals faster than others. Maximizing the Honor Social Policies will let you buy Great Generals with Faith starting in the Industrial Era, at about 1,000 Faith each and rising with each purchase.
Taking Honor gives you incentive to fight early, and early Wars will help even more - the Warlike are those who need multiple Great Generals. A Great Generals primary purpose is to provide a Combat Boost to all units within 2 tiles. This amounts to 15%, which is quite helpful when sieging a City or defending your own.
Constructing Citadels consume the Great General. This will snag an area of land 1 hex around the selected plot, which must be next to or inside your territory. Citadels provide a +100% defensive bonus to units inside, which can be huge if the Citadel is placed at a choke point. Enemies that end a turn next to the Citadel will take 30 damage per turn.
The Citadel is the one means of stealing an opposing Civ or City-State's tiles. You will culture-flip the tiles and take possession of them, which may anger another Civilization so do this at your own risk, but only with knowledge of the Diplomatic situation and how accepting of it they will be - you don't want to make this the tipping point for a war.
Here's a screenshot displaying effective use of a Great General to steal land from a City-State. The positioning is perfect, and gives my City more tiles to work. The Sheep, mine and farm are already improved and a worker can come in to replace the Citadel with a Mine to gain +Production from the Gold tile. Like all Great Person tile improvements, Citadels will only provide you with Strategic resources. To get the Gold, I require a Mine. To do this so effectively against another Civ, I'd need Open Borders. Thankfully, you can easily rob City-States of resources and Natural Wonders, and they will be back to neutral within 60 turns unless you provide a gift of Gold to speed up the process.
If you'd like to learn more about creating Great People, don't miss the first page of this guide dedicated to Listing Great People and Maximizing GPP through Buildings and Wonders. Share your tips about using and generating this Great Person through the comments form at the bottom of the page where your strategies can help players new to Civilization 5 and the Gods & Kings and Brave New World DLCs.
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