No! Miss Roseberry stood there at a distance, at a loss what to say next. "What can you do for me?" Mercy asked, stung by the cold courtesy of her companion into a momentary outbreak of contempt. "Can you change my identity? Can you give me the name and the place of an innocent woman? If I only had your chance! If I only had your reputation and your prospects!" She laid one hand over her bosom, and controlled herself. "Stay here," she resumed, "while I go back to my work. I will see that your clothes are dried. You shall wear my clothes as short a time as possible."

With those melancholy words--touchingly, not bitterly spoken--she moved to pass into the kitchen, when she noticed that the pattering sound of the rain against the window was audible no more. Dropping the canvas for the moment, she retraced her steps, and, unfastening the wooden shutter, looked out.

The moon was rising dimly in the watery sky; the rain had ceased; the friendly darkness which had hidden the French position from the German scouts was lessening every moment. In a few hours more (if nothing happened) the English lady might resume her journey. In a few hours more the morning would dawn.

Mercy lifted her hand to close the shutter. Before she could fasten it the report of a rifle-shot reached the cottage from one of the distant posts. It was followed almost instantly by a second report, nearer and louder than the first. Mercy paused, with the shutter in her hand, and listened intently for the next sound.

CHAPTER III.

THE GERMAN SHELL.

A THIRD rifle-shot rang through the night air, close to the cottage. Grace started and approached the window in alarm.

"What does that firing mean?" she asked.

"Signals from the outposts," the nurse quietly replied.

"Is there any danger? Have the Germans come back?"

Surgeon Surville answered the question. He lifted the canvas screen, and looked into the room as Miss Roseberry spoke.

"The Germans are advancing on us," he said. "Their vanguard is in sight."

Grace sank on the chair near her, trembling from head to foot. Mercy advanced to the surgeon, and put the decisive question to him.

"Do we defend the position?" she inquired.

Surgeon Surville ominously shook his head.

"Impossible! We are outnumbered as usual--ten to one."

The shrill roll of the French drums was heard outside.

"There is the retreat sounded!" said the surgeon. "The captain is not a man to think twice about what he does. We are left to take care of ourselves. In five minutes we must be out of this place."

A volley of rifle-shots rang out as he spoke. The German vanguard was attacking the French at the outposts. Grace caught the surgeon entreatingly by the arm. "Take me with you," she cried. "Oh, sir, I have suffered from the Germans already! Don't forsake me, if they come back!" The surgeon was equal to the occasion; he placed the hand of the pretty Englishwoman on his breast. "Fear nothing, madam," he said, looking as if he could have annihilated the whole German force with his own invincible arm. "A Frenchman's heart beats under your hand. A Frenchman's devotion protects you." Grace's head sank on his shoulder. Monsieur Surville felt that he had asserted himself; he looked round invitingly at Mercy. She, too, was an attractive woman. The Frenchman had another shoulder at her service.