The Courtneys actively campaigned for
world peace. They were accused of being "pro-
Boers" during the Second Boer War, receiving anonymous threatening letters, and Catherine was called "pro-Hun" after the First World War by the
Daily Sketch. She actively supported negotiating the end of both wars, joining the 1899 armistice campaign of
Emily Hobhouse, and later aligning herself with
Jane Addams' attempts to negotiate peace during the First World War, with the help of neutral nations. Throughout 1901, she visited
South Africa to report on conditions inside the
concentration camps built for Boer civilians. In 1906, her husband was elevated to
peerage and she became Baroness Courtney of Penwith. Lady Courtney championed the "innocent enemies" of the First World War and participated in the founding of an emergency committee aimed at helping German civilians living in Britain. She visited German
prisoners of war and publicised the work of her German counterparts in Berlin. She unsuccessfully pleaded with the
Home Office to prevent German aliens from being deported back to Germany. == Widowhood and death ==