The reason why the bewitching Empire's ship suffered so little damage was because there was a teleportation cabin in the ship. If the ship was severely damaged, the people on the ship could leave through the teleportation array. It was because of this that the casualties on the ship were so low.
The Naval fleet had indeed made a name for themselves in this battle. They had forced the sea beasts to retreat. This allowed the fleet to be free from the harassment of the sea beasts. At the same time, it also gave the people in the fleet more confidence.