are groups of buildings along roads where infantry and other light units can hide. It’s difficult to see into cities—they’re a great place to ambush tanks.
However, cities cannot be "captured" in the sense of the city coming under the player's control.
You can set up ambushes in citys with infantry.
Cities are one of the most crucial things in the game. Use them well
A city can be destroyed by bombs whch will then be where you can't set up ambushes