 She was arrested during a demonstration in Parliament Square for throwing a stone through the window of His Majesty's Treasury.She spent five days in police cells until bailed by her husband.At the outbreak of the First World War in 1914, she used her own considerable money to equip and staff a field hospital for French soldiers close to the Front in which she herself served as a nurse from 1914 until the end of the war, see Voluntary Aid Detachment.