In the autumn of 1915 Miss Stoney accompanied the hospital unit from Troyes when it was ordered to Serbia by the French authorities. Before leaving for Serbia she had the foresight to equip herself in Paris with a portable engine, as she was determined that her department should be efficient. On the committee refusing to sanction the expense, she bought it herself. Miss Stoney’s action was soon justified, for when the hospital was installed at Gevgheli in Serbia there was no electric supply. Thanks to her engine, not only was this the only British hospital able to work X-rays, but incidentally, as a by-product of the X-ray department, Miss Stoney lighted the entire hospital with electricity. The need of much electric light in the dark winter days meant hard work for Miss Stoney, and the following extract from a letter conjures up a picture of work in no easy conditions: “The electric light was needed in the pharmacy until the doctors had finished, and it was often late before I could stop the little engine and pack it up warm for the night.... When I creaked up the ladders in stockinged feet to the loft where fifty-four of us slept, there could be no thought of washing, with ice already in the jug; it was often an inch and a half thick by morning. Instead of undressing, one piled on every scrap of extra clothes one had, and put one’s waterproof under the mattress to stop the draught up through it.” When the French retreated from Gevgheli, a site was found for the hospital just outside Salonika, on a bit of ill-drained, marshy ground. There again the engine proved invaluable. From January, 1916, onwards Miss Stoney has run the X-ray department, doing, besides her own work, many radiograms for British and French doctors from other hospitals, who referred their cases to her for examination. At Salonika Miss Stoney again lit the hospital with electric light. For several months she was obliged to attend to the engine entirely alone, owing to the illness of the only mechanic. She further set up treatment by high frequency for the patients, and radiant heat baths with vibratory massage. Having previously studied the Zander treatment, Miss Stoney was able to instal an apparatus, which, though she describes it as rough, was very successful in treating stiff joints requiring movement. She also used ionisation for healing wounds with beneficial results.