"Most likely the man is using the crossbow on purpose to avoid attracting the attention of the Spaniards, Geoffrey. At this distance they could not see the crossbow, while a puff of smoke would be sure to catch their eye."
"There, he has shot again. I did not see the quarrel fall in the moat. See, one of the Spanish soldiers from that battery is coming forward. There, he has stooped and picked something up. Hallo! do you see that? He has just raised his arm; that is a signal, surely."
"It certainly looked like it," Lionel agreed. "It was a sort of half wave of the hand. That is very strange!"
"Very, Lionel; it looks to me very suspicious. It is quite possible that a piece of paper may have been tied round the bolt, and that someone is sending information to the enemy. This ought to be looked to."
"But what are we to do, Geoffrey? Merely seeing a Spanish soldier wave his arm is scarcely reason enough for bringing an accusation against anyone. We are not even sure that he picked up the bolt; and even if he did, the action might have been a sort of mocking wave of the hand at the failure of the shooter to send it as far as the battery."
"It might be, of course, Lionel. No, we have certainly nothing to go upon that would justify our making a report on the subject, but quite enough to induce us to keep a watch on this fellow, whoever he may be. Let us see, to begin with, if he shoots again.
They waited for an hour, but the head of the crossbow was not again thrust out of the window.
"He may have ceased shooting for either of two reasons," Geoffrey said. "If he is a true man, because he sees that his bolts do not carry far enough to be of any use. If he is a traitor, because he has gained his object, and knows that his communication has reached his friends outside. We will go down now and inquire who is the occupier of the next warehouse."
The merchant himself was not below, for as he did business with other towns he had had nothing to do since Sluys was cut off from the surrounded country; but one of his clerks was at work, making out bills and accounts in his office as if the thunder of the guns outside was unheard by him. The boys had often spoken to him as they passed in and out.
"Who occupies the warehouse on the right?" Geoffrey asked him carelessly.
"William Arnig," he replied. "He is a leading citizen, and one of the greatest merchants in our trade. His cellars are the most extensive we have, and he does a great trade in times of peace with Bruges, Ghent, Antwerp, and other towns."
"I suppose he is a Protestant like most of the townspeople?" Geoffrey remarked.
"No, he is a Catholic; but he is not one who pushes his opinions strongly, and, he is well disposed to the cause, and a captain in one of the city bands. The Catholics and Protestants always dwell quietly together throughout the Low Countries, and would have no animosities against each other were it not for the Spaniards. Formerly, at least, this was the case; but since the persecutions we have Protestant towns and Catholic towns, the one holding to the States cause, the other siding with the Spaniards. Why do you ask?"
"Oh, I hadn't heard the name of your next neighbour, and, was wondering who he might be."
The boys had now been nearly two months in Holland, and were beginning to understand the language, which is not difficult to acquire, and differed then even less than now from the dialect spoken in the eastern counties of England, between whom and Holland there had been for many generations much trade and intimate relations.
"What had we better do next, Geoffrey?" Lionel asked as they left the warehouse.
"I think that in the first place, Lionel, we will take our post at the window tomorrow, and keep a close watch all day to see whether this shooting is repeated. If it is, we had better report the matter to Captain Vere, and leave him to decide what should be done. I do not see that we could undertake anything alone, and in any case, you see, it would be a serious matter to lay an accusation against a prominent citizen who is actually a captain of one of the bands."
Upon the following day they took their post again at the window, and after some hours watching saw three bolts fired from the next window. Watching intently, they saw the two first fall into the moat. They could not see where the other fell; but as there was no splash in the water, they concluded that it had fallen beyond it, and in a minute they saw a soldier again advance from the battery, pick up something at the edge of the water, raise his arm, and retire. That evening when Captain Vere returned from the ramparts they informed him of what they had observed.
"Doubtless it is an act of treachery," he said, "and this merchant is communicating with the enemy. At the same time what you have seen, although convincing evidence to me, is scarce enough for me to denounce him. Doubtless he does not write these letters until he is ready to fire them off, and were he arrested in his house or on his way to the warehouse we might fail to find proofs of his guilt, and naught but ill feeling would be caused among his friends. No, whatever we do we must do cautiously. Have you thought of any plan by which we might catch him in the act?"
"If two or three men could be introduced into his warehouse, and concealed in the room from which he fires, they might succeed in catching him in the act, Captain Vere; but the room may be an empty one without any place whatever where they could be hidden, and unless they were actually in the room they would be of little good, for he would have time, if he heard footsteps, to thrust any letter he may have written into his mouth, and so destroy it before it could be seized."
"That is so," Captain Vere agreed. "The matter seems a difficult one, and yet it is of the greatest importance to hinder communications with the Spaniards. Tonight all the soldiers who can be spared, aided by all the citizens able to use mattock and pick, are to set to work to begin to raise a half moon round the windmill behind the point they are attacking, so as to have a second line to fall back upon when the wall gives way, which it will do ere long, for it is sorely shaken and battered. It is most important to keep this from the knowledge of the Spaniards. Now, lads, you have shown your keenness by taking notice of what is going on, see if you cannot go further, and hit upon some plan of catching this traitor at his work. If before night we can think of no scheme, I must go to the governor and tell him frankly that we have suspicions of treachery, though we cannot prove them, and ask him, in order to prevent the possibility of our plans being communicated to the enemy, to place some troops in all the warehouses along that line, so that none can shoot there from any message to the Spaniards."
Just as Captain Vere finished his supper, the boys came into the room again.
"We have thought of a plan, sir, that might succeed, although it would be somewhat difficult. The dormer window from which these bolts have been fired lies thirty or forty feet away from that from which we were looking. The roof is so steep that no one could hold a footing upon it for a moment, nor could a plank be placed upon which he could walk. The window is about twelve feet from the top of the roof. We think that one standing on the ledge of our window might climb on to its top, and once there swing a rope with a stout grapnel attached to catch on the ridge of the roof; then two or three men might climb up there and work themselves along, and then lower themselves down with a rope on to the top of the next window. They would need to have ropes fastened round their bodies, for the height is great, and a slip would mean death.