When Cannons Speak

Reach the anti-ship squadron on the shore to the east from the Shore City, kill all enemies in your way, and find out what happened.

Oh my! It's the shore squadron firing!
But... there were no survivors!
Who is doing that? What are they firing at? At the Alliance fleet?!
I think we can handle it here on our own, and you should go there and find out what is going on.

Hey, get over here! Make sure those empty-eyed don't see you - it seems that they are firing the cannons.