But with Nona Davis and Mildred Thornton, the two Red Cross nurses who had given the most valuable personal service, since the outbreak of the war, the situation was more serious and far more difficult to meet. They did not neglect their duties, this would have been impossible to either of them, and yet in a way it was plain that they were no longer wholly absorbed by them and to use an old expression, their hearts were no longer in what they were doing. Yet Sonya understood; both girls were engaged to be married to young American officers who were at present in the United States. With the signing of the armistice they had hoped to return home. It was possible they had made a mistake in agreeing to Dr. Clark's request that they remain for a time longer in Europe, forming a part of his Red Cross unit, who were to care for the soldiers of the American Army of Occupation. With Mildred Thornton the engagement was comparatively recent. During the latter part of July she had nursed through a dangerous illness, following a wound, an American lieutenant[A] who, together with Carlo Navara, had crossed into the German lines, securing important secret information, afterwards invaluable to Marshal Foch. Of longer standing was Nona Davis's romance, which had not been of such plain sailing. In the early months after the entry of the United States into the world war, in an American camp in France, she had met and renewed an acquaintance with Lieutenant John Martin which had begun as children years before in the old city of Charleston, South Carolina. Soon after Lieutenant Martin had declared his affection, but believing him arrogant and domineering, Nona had not at that time returned his love. Later, meeting again upon a United States hospital ship, coming back from France, Nona had discovered Lieutenant Martin, now Captain Martin, blinded through a gallant action on the battlefields of France. It was then that their former positions were reversed, for Captain Martin would not accept a devotion which he believed born of pity and declined marrying Nona unless his sight were restored. A short time before a letter from New York announced that after an operation, Captain Martin had the right to believe his sight would be fully regained. Therefore would Nona marry him as soon as it could be arranged? And Nona's answer had been to cable, "Yes."[B]