1913, Edward unwittingly becomes a witness in an impending divorce when he spies rising Tory MP Lord Charles Gilmour leaving the bedroom of a fellow MP's wife. Edward is pressured to change his story, but he refuses, and the case is withdrawn due to Richard's influence. The servants are offered a day's holiday in Herne Bay in Kent in August 1914. They enjoy a rare day out together. Hudson is persuaded to sing on the vaudeville stage but their enjoyment is curtailed by an announcement that Germany has invaded Belgium. Hudson sings "Rule Britannia" instead. Back in London they gather to mark the hour when Britain goes to war. In the Christmas episode, "Goodwill to All Men", Cathleen Nesbitt returns for a second and final appearance as Lady Southwold. Fourth series, set in 1914–1918 James serves in World War I, is seriously injured in a trench battle and brought home, amid much difficulty, to recover. He is nursed by his step-cousin Georgina, who now volunteers as a VAD Nurse and serves in France during the war. Georgina and James develop a close understanding and affection during the war but do not go so far as to become lovers. Downstairs, Edward signs up and fights in the trenches, Hudson serves as a Special Constable, Rose works as a bus conductress, and Ruby leaves Eaton Place to work in a munitions factory in Silvertown, returning to service after the Silvertown explosion. Hazel, unknowingly echoing her late mother-in-law Lady Marjorie, has a brief affair with an RFC Lieutenant named Jack Dyson who, like herself, has risen from the ranks of the middle classes. He is killed while James is at home on leave. Rose meets up with Gregory Wilmot again. After overcoming their emotional and practical hurdles, she finally agrees to marry him on his return from the war and follow him to Australia. However, he is killed in action. Rose is heartbroken but Gregory has left her £1,275 in his will, enough to make her independent in her retirement. Edward returns, and while not physically wounded, suffers badly from shell shock and goes into hospital. He speaks to Richard, who comforts him, assuring him that mental wounds are as real as physical, and no mark on his character. The fourth season ends in 1918 with the close of World War I. Both James and Georgina return from their wartime duties. Despite the