There were plenty of protests, but finally the company listened to reason. One by one, they hid in the barrels on the barge. Kili found it impossible to sit comfortably; while in hiding, he tried to get a look at the gash on his leg. The way Saeril had acted was indeed worrisome.
Without any visual, Kili grew uneasy. "What’s he doing?”

Bilbo peered through the hole in the barrel. “He’s talking to someone. And he’s...pointing right at us! Now they’re shaking hands.”
Thorin's eyes narrowed. “What?”
Dwalin was ready to fight if necessary. “That villain! He’s selling us out.”
Just then, each and every barrel was filled to the brim with dead fish. 

- - - 

 “It means they intend to unleash a weapon so great it will destroy all before it.”
Thranduil responded evenly, and then he looked to the guards arriving.  “I want the watch doubled at all our borders. All roads, all rivers. Nothing moves but I hear of it. No one enters this kingdom, and no one leaves it.”