In the story of Prometheus. Are the gods truly mighty?

Yes , they are

Explanation:

The word 'mighty' indicates that the being possess tremendous power. Not referring to their personality.

The Gods in the story of Prometheus had the ability to create natural disasters to for the mortals even without having to spend much efforts.

For example, a God called Zeus has the ability to control Thunder to bring destructions to the enemy. His Brother Poseidon has the ability to control the seas and every living creatures in it.

it would be  

germany had to pay all damages related to the war.

and i think

germany had to take sole responsibility for the war.