"Of course they can't tell in the least who they are firing at," the captain said. "They cannot have learnt anything yet, and can have only known that there was firing off the port, and that a craft is making out. We may be one of the sea beggars' vessels for anything they know, and may have come in to carry off a prize from under their very noses." "That is so," the mate replied; "but the gun may have been fired as a signal as much as with any hope of hitting us." "So it may, so it may, Peters; I did not think of that. Certainly that is likely enough. We know they have several ships cruising in the Zuider Zee keeping a lookout for the beggars. On a night like this, and with the wind astern, the sound will be heard miles away. We may have trouble yet. I was not much afraid of the galleys, for though the wind is so light we are running along famously. You see we have nothing in our hold, and that is all in our favour so long as we are dead before the wind. Besides, if the galleys did come up it would probably be singly, and we should be able to beat them off, for high out of water as we are they would find it difficult to climb the sides; but if we fall in with any of their ships it is a different matter altogether." Four or five more shots were fired, but they all fell astern; and as they were fully two miles and a half away when the last gun was discharged, and the cannoneers must have known that they were far out of range, Captain Martin felt sure that the mate's idea was a correct one, and that the cannon had been discharged rather as a signal than with any hope of reaching them. "Ned, run up into the foretop," the captain said, "and keep a sharp lookout ahead. The moon has given an advantage to those who are on our track behind, but it gives us an advantage as against any craft there may be ahead of us. We shall see them long before they can see us." Peters had been looking astern when the last gun was fired, and said that by its flash he believed that he had caught sight of three craft of some kind or other outside the ships moored off the port. "Then we have two miles' start if those are their galleys," the captain said. "We are stealing through the water at about the rate of four knots, and perhaps they may row six, so it will take them an hour to come up." "Rather more than that, I should say, captain, for the wind at times freshens a little. It is likely to be an hour and a half before they come up."