"I've drawn a map of the Confederate position. It's in pencil, but it ought to help."
"It will be beyond price!" exclaimed Dick. "You will give it to me?"
"Of course! But you must wait a minute! Until I heard my brother's whistle I didn't know whether it was North or South that I was going to meet on the mountain."
She disappeared in the bushes, and Dick heard a light rustling, but in a few moments she returned and held out a broad sheet of heavy paper, upon which a map had been drawn with care and skill. He had divined already its great value, and now his opinion was confirmed.
"I can't thank you," he said, as he took it, "but General Sheridan and General Grant can. And I've no doubt they'll do it when the time comes."
Again the light flush appeared in her cheeks and she looked actually handsome.
"Since my present task is finished," she said, "I'd better go."
"Where did you leave your horse?" asked Shepard.
"He's tethered in the bushes about a hundred yards farther down the side of the mountain. I'll mount and ride back in the direction of Richmond. I know all the roads."
Sergeant Whitley, who had gone a little higher up and who was watching while they talked, whistled softly. Yet the whistle, low as it was, was undoubtedly a signal of alarm.