Attacking cities, flags, and alliance forts is one of the best game mechanics in Rise of Kingdoms. When you are attacking cities, flags, and alliance forts, some of your troops will die and some will go to the hospital. There are a lot of different commanders for attacking.
In Rise of Kingdoms, you have the option to either rally or solo attack cities, flags, and alliance forts. The problem with attacking a building is that you will lose a lot of troops.
Training troops in Rise of Kingdoms can be challenging, particularly for new players. Therefore, it is advisable to refrain from attacking buildings, as you need troops to destroy barbarians and gather resources.
Attacking Cities
You can attack cities either solo (swarming) or with a rally. When attacking the city, you must be careful and use the right commanders.
Attacking cities can be risky, and you could lose a lot of troops. Before you decide to attack the city, you must know a few things. First, you must scout the city to see what commanders are defending and how many troops each city has, and then, with a scout report, you can decide if it is worth attacking the city.
Some items can be used to block scouts, and that will show double troops in the city.
Every city has garrison commanders that players can choose from. If he has bad commanders on the wall, then you have a higher chance of succeeding in the attack.
After you check the commanders and troop count, you must know that every city has a watchtower and wall. If a player has a high level of watchtowers and walls, it will be harder to destroy them.
When you attack a player’s city and you destroy it one time, his city will start burning, and the durability of the watchtower and wall will go down drastically. When city wall durability drops to 0%, the city will be randomly teleported on the map. If you stop attacking, the city will stop burning after some time.
But do not worry. You will have a lot of time to attack and loot the city before durability drops to 0.
Attacking cities with solo troops: Avoid this as much as you can. It is not worth it. If a city is the same power as you or stronger, you will get destroyed, and you will lose so many troops in a short amount of time.
Attack solo only if you find a small city with a lot of resources; for big cities, you must attack it with a rally.
Attacking cities with a rally—this is the only method that is worth it. You will be able to destroy the city very quickly. Do not start a rally if you do not have great rally commanders. It is better to ask a strong player in your alliance to start it.
If you have a castle at the highest level and technology, your rally can have 2.5 million troops. Now compare 2.5 million troops against your own troops. With a big rally, you will be able to do an insane amount of damage in a short period of time.
The best troops for attacking cities are sieges. Siege units are great against watchtowers. But the biggest reason why you will use siege units is that you do not want your archers, cavalry, and infantry troops dead and you will never use siege troops for field battles.
If you are a new player, avoid attacking cities as much as you can. It is not worth it for your troops. Only Attack players who have an insane amount of resources in the city. If you decide to attack the cities of other players, you should use the best civilization in the Rise of Kingdoms, and that is Arabia.
Attacking alliance flags and fortresses
You will be able to attack alliance flags and fortresses only if your alliance is connected with the territory of an enemy alliance. Alliance forts and flags can also have main defending commanders.
If they leave buildings, new defending commanders will be chosen automatically. You must be careful with this, especially while your alliance flags and forts are under attack. Alliance leaders and R4 officers with titles can change defending commanders.
If you succeed in a rally or solo attack, a flag or fortress will start burning.
R4 officers can extinguish fires with alliance coins or with gems. Keep in mind that flags and forts will automatically stop burning after some time, so you will need to attack them again.
Alliance fortresses have much more durability when compared to flags, so alliance flags can be destroyed much faster.
You must also keep in mind that when you are attacking alliance fortresses, all your troops will die, and when attacking flags, only a portion of your troops will die.
Do not attack solo flags and forts if they are full of troops. That is how you will lose troops very fast. If you see AOE commanders like 
Yi Seong Gye defending, move your solo troops away. His AOE damage will kill your troops if they are close to a building or attacking a rally. That is how most players lose so many troops without noticing.
My advice to you is to keep a distance. You never know when the enemy can change normal commanders to AOE commanders.
If you are not sure what commanders are strong for defending and attacking flags, cities, and fortresses, you can check our commander tier list.