"When we are once in the house, Sebastian, I think we had better not keep near each other; then, if one is by any chance detected the other can make a bolt for it."

"Yes; I think we might as well keep apart. I am more likely to be detected than you, but the risk of discovery would be greater for you than for me. As a relative, it would be thought natural that I should wish to be at the wedding. I might be shot by the Carlists, but my uncle would take my part, and at any rate it would be evident that I did not come as a spy; whereas, if you were caught it would be very awkward for you, though of course I should say that you came as my friend, and had no idea of entering their lines. Still, it would be very awkward; and if you should see that I am taken, I advise you to slip quietly off at once."

Arthur, however, had no intention of remaining any time at the house and waiting till his companion was ready to leave, for the latter would certainly object to share in his own plan of making his way down through the Carlist lines. And as he was going in a way as Sebastian's guest, he could not very well leave him. The house was but a quarter of a mile, his friend had said, from the upper line of the works; and, even if detected, he could, with the advantage of a surprise, easily get there before being overtaken. Not, indeed, that he expected to be pursued. His intention was to slip away quietly soon after getting to the house, and to stroll down to the lines, where it was improbable in the extreme that he would be challenged.

"If by any chance I should not turn up, Sebastian, when you want to come away, you had better go down to the boat and wait there for a quarter of an hour, and then push off. You may not be able to row much, but you could certainly manage to get over to the other side, and then you would only have to let her drift."

"Yes; but there can be no reason why we should not come away together."

"Well, you see, one or other of us may be suspected, and it may be necessary to slip off. I don't say that it is likely at all, but there is nothing like being prepared for all emergencies."

After a quarter of an hour's walk they reached the house. It was, as they had expected, full of officers and friends. The ceremony had just been concluded, and many were going up to the bride and bridegroom offering their congratulations. Music was being played, and servants were handing round refreshments. Sebastian joined those clustered round the newly-married pair, while Arthur mingled with those standing in groups round the room. He had scarcely been there a minute when he noticed that the eyes of two or three of his neighbours were fixed upon him curiously. Wondering why their attention should be attracted to him, he put his hand up to his face, and to his horror found that half his moustache was gone. He had become warm when rowing, and this had doubtless moistened the gum with which he had fastened them on to his lip.

He at once made for the door, but as he left the room he glanced round and saw that three or four of the men who had observed him were speaking together and making after him. The moment he was outside he started to run. He had gone but twenty yards when there was a shout behind him. This unexpected discovery had altogether upset his plans. He had calculated on being able to stroll quietly down into the Carlist lines. Now he would have to exert himself to the utmost to get there before his pursuers, who were close upon him. He ran at the top of his speed, looking round once or twice as he did so. He gained on his pursuers, who, now convinced that there was something wrong, exerted themselves to the utmost to overtake him. As he neared the brow of the hill he could hear talking and laughing in front of him, and soon he came upon a line of fires round which soldiers were gathered. His pursuers now, though he could no longer see them, began to shout loudly, "A spy, a spy! Seize him!"

For a moment or two the talk by the fire ceased, and the men stood listening to the cries. They were therefore unprepared for action when Arthur dashed through them--he had no time to choose a place--and knocked over two or three who endeavoured to grasp him. In a moment he was running down the hill with a hundred men in pursuit. Presently he saw a high embankment ahead of him, which he knew must be the highest point of the defences. He ran up it, and, when he reached the top, jumped. It was a fall of some fifteen feet, but the ground was soft where he alighted, and, picking himself up, he ran on. He had not gone fifty yards when a musket was fired from the top of the embankment. This was followed by a dozen others, and the fire grew into a roar. Evidently the Carlists, in their bewilderment as to what had happened, were firing at random. Presently he came to a wall, which he vaulted over as a number of men ran up.

"What are they firing about?"