C410 What Was Going On?

Just as Iowa was feeling pessimistic, she suddenly heard a series of gunshots behind her.

No, it could not be said to be intensive, because the sound of the cannons did not stop at all. At least, Iowa could not hear it.

The sound of the cannons resounded through the air, and even the sound waves were compressed. It sounded like some kind of wail.

At the same time