# Main City Building Introduction ## Main Base
The main base is responsible for managing the overview of the city's internal affairs. Upgrading the main base can unlock new buildings and functions. Other building levels cannot exceed the main base level. ## Barracks ### Infantry Battalion
Buildings for training infantry, upgrading infantry battalions can train more new types of troops. ### Guerilla Warfare
Buildings for training mobile units, and upgrading guerilla warfare can train more new types of troops. ### Artillery Corps
Buildings for training artillery troops, upgrading artillery corps can train more new types of troops. ### Armored Vehicle Force
The place where siege machines are made. Upgrading the armored vehicle Force can make more new siege machines. ## Powder Magazine
Gunpowder is made in a powders magazine, and players attack the enemy siege force while defending the city. When facing the intruding enemies, if there are enough defenders in the city, gunpowder will be effective, and randomly destroy some enemies according to the relationship between gunpowder restraint. ## Storehouse
The storehouse is not a place to store resources, but a building to ensure that protected resources are not plundered. Upgrading the storehouse can increase the resource protection space and protect more resources from being plundered. ## Drill Grounds
It's a place to assemble the soldiers who have completed the training. Upgrading drill ground can increase the upper limit of the number of troops that can be dispatched. The expedition operation cannot be carried out before the construction of the drill ground. ## Air-drop Station
Call the building of the air-drop station, and invest Gold to call the airdrop to get the air-drop resources. Upgrading the air-drop station can increase the times of free airdrops every day. ## Technology Research Institute
Technology Research Institute is an important building for your city, and different kinds of researched technologies will improve your city in an all-round way. It is divided into four types of technology: military, city defense, resources, and city development. ## Equipment Library
It's a place to forge equipment. Upgrading the equipment library can speed up the forging of equipment and reduce the consumption of polymer steel. ## Radar Station
The radar station mainly has 2 functions, including detecting the enemies and getting to know the real-time information of enemies' marching towards you. Increasing the level of the radar station can obtain more detailed information. ## City ​​Wall ​
The city wall is a place to station the soldiers who are defending the city. Upgrading the city wall can increase the capacity of gunpowder and the defense value of the city. The city defense value can be understood as the life value of the main base city wall, which can be viewed at the city wall defense. After the city defense fails, the city defense value will decrease. When the city defense value drops to 0, the main base will be randomly relocated by the system. ## Resource Output Building ### Food factory
They are the buildings that can produce and store food. ### Power Plant
They are the buildings that can produce and store electricity. ### Refinery
They are the buildings that can produce and store ore. ### Alloy Factory
They are the buildings that produce and store metals. ## Hospital
The hospital is where the wounded soldiers are treated. Upgrading the hospital can enlarge the capacity to treat more wounded soldiers. ## Camp
It's a place to assemble the soldiers. You can obtain quicker and more training by upgrading the camp. ## Defense Tower
The defense tower is a city defense facility, which can attack the enemies when defending the city. Upgrading the defense tower can increase the attack power and attack speed of the defense tower. Upgrading the defense tower needs to consume golden arrows. ## Diplomatic Center
Diplomatic center level affects how well it works when aided by allies. ## Command Center
After building the command center, you can use the rally function, and can view the alliance war in the alliance interface. Upgrading the command center needs the War Horn item. ## Exchange
After helping the resource, there will be a transport team marching towards the assisted player, and the transport team will be counted as marching troops. By increasing the exchange level, you can get more aided resources and reduce the tax rate each time. ## Material Workshop
In material workshop, you can arbitrarily produce desired equipment materials. Click and drag the material you want to produce to the central or production queue slot. ## Bar
Completing various daily tasks in the game every day can increase the activity level. When the activity level reaches a certain amount, you can receive the activity level treasure chest. When the weekly activity level reaches the standard, you can also receive the weekly activity treasure chest. ## Transport Station
It is used for sign-in activities. You can log in to the game every day to get rewards. If you don’t sign in, you can’t make it up. ## Wandering Merchant
You can buy resources, acceleration, buffs, and other special discount items from wandering merchants with gold coins or resources. Merchants can refresh three times a day for free. And then refreshes need Gold, which need more with refreshes times. ## Troop Details
Troop details will show all the troops you have.Formation can be set on the interface, and the expedition force can be quickly selected according to the set formation when expedition.