General Gorlok at the lighthouse in Venture Bay wants you to destroy the Alliance Lumber Boat.
General Gorlok will only be present at the lighthouse when the Horde has it in their possession.
You there, <race>! Get your lousy carcass over here!
The Alliance have a shipment of lumber all ready for transport just northeast of here. Since getting our hands on that wood is out of the question, there's only one thing to do - destroy it!
The goblin at the end of the dock here has some torpedoes all ready to go. He's got all the fuel for them on the docked goblin ship to the north.
Get some fuel, then commandeer one of the torpedoes and ride it into their ship.