Nona and Barbara were startled by the voice out of the darkness, but they murmured confused thanks.

“Perhaps we had best not discuss our surroundings so openly,” Nona suggested, and Barbara agreed with a silent motion of her head.

By this time they had reached the central bridge. It was built of steel and stretched like a long line of silver across the dark river.

Over the bridge, like enormous over-burdened ants, the American girls could see other ambulance wagons moving slowly on. For the horses had become weary of their heavy loads and yet were to have no rest of any length until daylight.

On the farther side of the river there were other small encampments. But by and by Barbara Meade fell asleep with her head pressed against Nona’s shoulder.

Occasionally Nona drowsed, but not often. She was torn between two worries. What would become of Mildred Thornton, left behind with strangers in a besieged fortress that might fall at any hour? Surely her situation was more fraught with danger than any in which the Red Cross girls had found themselves since their arrival in Europe.

Nona wished that she had taken sides with Barbara more decisively and refused to leave Grovno unless Mildred accompanied them.

But Mildred had disappeared so quickly. Then the order had come for their departure almost at the same instant. There had been so little time to protest or even to think what was best. Certainly Mildred herself should have refused to accept such a dangerous responsibility. But at the same moment that Nona condemned her friend, she realized that she would have done exactly the same thing in her place. In coming to assist with the Red Cross nursing they had promised to put the thought of duty first. Mildred could not shirk the most important task that had yet been asked of her.

Perhaps no harm would befall her. Certainly Nona appreciated that everything possible would be done to insure Mildred’s safety. Her life and honor would be the first charge of the soldiers surrounding her. Moreover, General Alexis would certainly leave the fortress before there was a chance of his being taken prisoner. He was too valuable a commander to have his services lost and the Germans would regard him as too important a capture.

So Nona’s attention wandered from Mildred to her other friend, Sonya Valesky. What had become of Sonya and how was she ever to find her in the great and unknown city of Petrograd? If she only had a friend to consult, but she had even been compelled to leave Grovno without seeing Lieutenant Orlaff again. He had promised to write a few letters in Sonya’s behalf, although assured that they would do no good.