How does China's grand plan attack sister cities?

The script is to expand the territory and choose the country. . . Then the question is, as a small country in the western region, there is no other way to break the city except superior military strength when facing the defenders of the computer city. _(:з」∠)_

When we face a city with a large number of garrisons and perfect city defenses, but our technology has not been upgraded (if we choose a small country, people will be less knowledgeable, and this situation will last for a long time), the best way is to eliminate the defenders of the opposite city, but the damage received by siege is also considerable. At this time we need to transfer the computer troops out of the city? ~(? ε`) It is best to transport troops (I believe that everyone has a deep understanding, and a transport force of 10,000 people is a fish on the chopping block)

Goal: occupy the city's S.