When World War I broke out, both Jane and Wilfrid joined the staff of a British hospital for French soldiers, Hôpital Temporaire d'Arc-en-Barrois, Haute-Marne, France in January 1915. On their return to England the following year, Wifrid was commissioned and seconded to the Front in Italy in 1917. After the war they returned to England, and Wilfrid held a solo exhibition at the Leicester Galleries and another solo show in New York in 1920. For the next decade the two would spend summers in Cornwall and winters in France.