How do I use Armageddon's Blade?

For example: you see that the opponent's dog is clearly winning and is about to reach your castle, and it's obviously not a good idea to run away with your hero. Then, simply and without hesitation, use Armageddon on your own troops so that you don't die alone, and then, before defeating this enemy, run away and revive in the city, buying a new army. This will give you a slightly better chance of winning. But it's not a guarantee that this operation will succeed. He might kill you before you can escape, and you'll lose a good hero. So, it's all up to you, based on your fear and risk tolerance.