On 6 February 1899 Campbell-Bannerman succeeded Sir William Vernon Harcourt as Leader of the Liberals in the House of Commons, and Leader of the Opposition. The Boer War of 1899 split the Liberal Party into Imperialist and Pro-Boer camps. Campbell-Bannerman faced the difficult task of holding together the strongly divided party, which was subsequently and unsurprisingly defeated in the "khaki election" of 1900. Campbell-Bannerman caused particular friction within his own party when in a speech to the National Reform Union in June 1901 and shortly after meeting Emily Hobhouse, he described the concentration camps set up by the British in the Boer War as "methods of barbarism".