Your strategy is the key to victory.
Choose how to repel attacks: Hold back enemy forces with towers, or enlist the help of monsters that you can place in the way of defense.

Towers are a strong barrier against aggressors, so don't forget to upgrade them: improve their power, increase their range, and make them more resistant to attacks.

Or you can turn to monsters, which is an unusual way to defend yourself. Monsters are not only your enemies, but also your allies. You can use them in your strategies by sending them to the battlefield.