How to damge enemy base?

Depending on which type of server you are playing in (in this case assuming you are playing ranked), you must wait for the raiding time which you can find in the tips somewhere in the top left of your screen. Depending on which type of level the defense is, you need different tools to break them. All bombs to damage to bases but weaker bombs do less damage to higher level defenses such as walls. Bats are good for wooden defenses and iron hammers are good for stone defenses.