Support your own soldiers with your own hero. The enemy will come regularly. The enemy will attack in 3 different ways. Don't forget to roam around. You can find a few items around.
Enemies will advance by destroying your towers. You can join battles while elves and dwarves fight each other. Wolves and different animals can be found in the environment.
If you can destroy the opposing side's main tower, you will win the war.
Good luck!!