Vs. From Below

The Kraken cometh... From the deepest trenches of the ocean, the Kraken has come to lay waste to your city! The archers have slung every arrow. The burning tar has run dry. Every piece of military weaponry has been dispatch. And yet... the Kraken moves forward, climbing the towering walls of your seaside fortress. With no ammunition left, the city itself moves from a barricade, to a weapon! The stones of the walls are broken off, and hurdled down at hideous creature. And it just might be enough to slow it down till morning, when surely help will arrive...