"What is all that earth for in the corner, Guy?" Sir Eustace asked as they re-entered the castle after having made a survey of the new works. "I had that brought in, my lord, to fill sacks, of which I had three hundred made, so that if guns and battering machines were brought against us, we might cover the wall at the place they aimed at with sacks hanging closely together, and so break the force of the stones or the cannon balls."