The War City

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The war city is your bread and butter, so to speak. It's the city that you stack up full of troops and move around to attack people with. 
==The Layout- Resource Sector==
http://prntscr.com/2u482j
Your war city is going to be all farms, with 1 Steel, Oil, and Rare Metal plant, although once your war city is complete, you can remove the oil and rare metal plants and put in extra farms. 
The whole point of a war city is to be able to hold and produce as much food as possible in order to sustain your army. Once you enter the later stages of the game and have a war city that is 5, 10, 20, 40 million in the red per hour, you'll be grateful that your city can hold 100 million+ food.
==The Layout- Military Sector==
http://prntscr.com/2u49b1
This is one of the more ideal layouts of a war city. You're going to want a TON of warehouses, between 18 and 23, in order to hold as much food as possible. If you're willing to spend a bit of money, you can get away with only 2 or 3 level 15 houses, in order to squeeze in an extra warehouse. As well, once your war city is around 20-40 million in the red per hour, you can get away with tearing down the communications center, as being reinforced will be unneccesary, although I personally advise against it unless you are an experienced player.
Also, your war city is usually going to have the highest level General Headquarters out of all your cities, since being able to send as many troops as possible per hit is going to be one of your top priorities for your war city. This is also because adding level 13, 14, and 15 GHQ's to every city would be expensive, both resource wise and money wise. This way, you're accomplishing multiple goals, namely troop storage, offensive, and defensive capabilities, all in 1 city.