In 1899 came Mafeking, the most notable episode in his outstanding military career, by which he became a Major-General at the age of only 43. B.-P. became famous and the hero of every boy, although he always minimized his own part and the value of his inspiring leadership. By using boys for responsible jobs during the siege, he learned the good response youth give to a challenge. During the 217 day siege, B.-P.'s book Aids to Scouting was published and reached a far wider readership than the military one for which it was intended. Following Mafeking, B.-P. was given the task of organizing the South African Constabulary and it was not until 1903 that he returned to England as Inspector General of Cavalry and found that his book, Aids to Scouting was being used by youth leaders and teachers all over the country. He spoke at meetings and rallies and whilst at a Boys' Brigade gathering he was asked by its Founder, Sir William Smith, to work out a scheme for giving greater variety in the training of boys in good citizenship.