You can use spies to gather information about the city's defenses, including the strength and type of troops within it, the amount of food and gold in the city's treasury, and any traps that have been set. This information can be invaluable when planning your attack.
Scout
To gather more information about the city, you can send scouts to view it. However, be wary! As scouting can be risky, there is a chance you will lose units when scouting a higher level city than your own.
Train your troops
The most important factor in conquering a city is the strength of your troops. Make sure to train your troops regularly and equip them with the best weapons and armor you can afford. You should also research military technologies to increase the effectiveness of your troops.
Build siege engines
Siege engines are essential for attacking cities. They can be used to destroy the city's walls and gates, making it easier for your troops to enter the city. You can build siege engines in your city's workshop.
Form alliances
If you are not strong enough to conquer a city on your own, you can form an alliance with other players and attack the city together. Alliances can provide you with additional troops and resources, making it more likely that you will succeed in conquering the city.
Time your attack
You should time your attack carefully. The best time to attack a city is when the defender's troops are out of the city, such as when they are gathering resources or attacking another city. You should also avoid attacking a city during the day, as the defender will have a greater advantage in battle.
Attack!
Once you have completed all of the above steps, you are ready to attack the city. Be sure to use all of your resources wisely, and be prepared for a tough fight. If you are successful in conquering the city, you will be rewarded with a wealth of resources and a valuable stronghold in your empire.
Defend your city
Once you have conquered a city, you need to defend it from other players who may try to take it from you. You can do this by building strong walls and gates, training troops, and setting traps. You can also form alliances with other players to help defend your city.