"Who are you, and where is the captain of the guard?" asked Serano, starting back in surprise when he saw O'Connor.

"The captain is engaged at present," said O'Connor, bowing and smiling impudently; "what can I do for your excellency?"

"Take me at once to the American prisoners. I have decided to revoke the two days' reprieve. Their sentence shall be executed in the morning unless they choose to bend their stubborn spirits and tell me for whom they are acting. They are not alone in this thing. Even now their friends may be gathering and threatening our outposts."

"That is quite true, your excellency; it certainly is wise to take every precaution. Your visit was very well timed, as a few minutes later you might have found the prisoners out. They were just starting for a little airing. The prison is very close, don't you think?"

Serano looked puzzled, and O'Connor said, in English:

"Step forward, boys, and say 'How-de' to his excellency."

Harry and Bert came from behind the men, and stopping in front of the general, saluted him gravely.

"What does this mean?" demanded Serano, looking from the boys to O'Connor, as a suspicion that all was not right flashed into his mind. "Where is the captain of the guard? I insist that he shall report to me at once. And who are you, sir, who usurps the authority of the commandant here?"

"I am Captain Dynamite, at your service, your excellency," said O'Connor, making an elaborate bow and doffing his sombrero so that his features were revealed to the now thoroughly frightened general.

Serano leaped back and for a moment seemed dazed. Then his eyes fell on the eight soldiers standing back of the boys. His waning courage returned, and drawing himself up, he pointed his finger at O'Connor as he addressed the men.