What do I do if I'm under attack?

Spend all your resources and deploy all your troops so they won't die in the city. Your shelter will take damage but you won't lose any troops and resources are free. It just sets you back because you have to wait for more resources.

If you are going to get hit you can more your troops out to protect them from being killed as suggested above. Assuming the enemy is stronger.

If you want to safeguard your resources as well then you can protect yourself buy putting up a shield (8 hour, 12 hour, 24 hour and 3 day are available) if you can afford to buy one with diamonds or have one from previous rewards.

You can also use a teleport item (random or advanced) to move your base. This will break off the attack. Hopefully the enemy won't know where you have moved to.

How do you stack and defend