The full meaning of that startling discovery was made evident to them an instant later. The officer of the Spaniards was standing to one side watching a man, who, with bowed head, was carefully scanning the ground. And he was coming slowly toward the building. "They're tracking us," whispered Clif. And just then the man raised up his head and Clif got a glimpse of his face. "The villain!" he gasped. It was Ignacio! Yes, it was the villainous Spanish spy. He and his Spanish companions must have succeeded in getting ashore. And they had tracked their unsuspecting enemies to their hiding-place. "I wish I had killed him!" Clif muttered half to himself. One of the sailors heard him, and he drew his revolver significantly. "It's not too late, sir," he said. But Clif held up his hand. "No, no," he whispered. "Not yet!" That suggestion called him back to action. Not yet--because they had not yet been discovered. Ignacio was apparently off the scent; he did not know whether his victims had dodged the building or had the temerity to enter. And instantly Clif leaped forward, over to the other side of the building. If none of the enemy was there it might not be too late for flight. "If they are," Clif muttered to himself, "by jingo, they've still got the building to capture." Whatever was to be done had to be done quickly, for Ignacio was a cunning fellow, and wouldn't be apt to delay very long. Clif gazed out in the other direction and saw to his delight that the thicket came close to the house, and there were no Spaniards in sight. He called in a low voice to the men, who stole silently over toward him. "Quick!" he gasped. "Out, for your lives!" It was a thrilling moment, and Clif was trembling with eagerness. One by one he watched the men crawl out of the low window and gather in the shelter of the building. And a moment later he himself dropped down; the instant he struck the ground he started forward. "To the woods!" he whispered. "And not a sound, for your lives." And the men sprang softly forward, not even pausing to glance over their shoulders to see if they were discovered. Clif fancied at that instant that he was safe. The building was between him and the Spaniards. But he did not know that at that moment Ignacio had observed a footprint in the damp ground that made him aware that they had gone into the building; he rushed around to the other side just in time to see a blue uniform vanish in the thicket. The next moment a wild yell came from his throat. "Mira!" he shrieked. "Forward! Here they are now!" CHAPTER XI. A RUNNING FIGHT. That cry seemed the death knell of the Americans, and their hearts leaped up in their throats when they heard it. For a moment Clif thought of stopping and giving battle then and there.