Stuart knit his brows and reflected. Then he called to the orderly.

“Wake the adjutant-general, and have three couriers ready at once!”

Mr. Nighthawk arose.

“By-the-by, general,” he said, “I saw Swartz, whom I have mentioned to you.”

“Yes; the best spy, you say, in the Federal army.”

“I think he is, general. He is a wonderful man. He recently played a trick upon you.”

“Upon me?”

“At least he bore off a prisoner from you. It was a lady, captured by Colonel Mohun, one night on the Rappahannock.”

“Ah! Is it possible! So Swartz was the old countryman, driving the wagon that morning.”

“So he informed me, general.”