In mid-June 1896, during their joint scouting patrols in the Matopos Hills, Burnham began teaching Baden-Powell woodcraft, inspiring him and giving him the plan for both the program and the code of honor of Scouting for Boys. Practiced by frontiersmen of the American Old West and indigenous peoples of the Americas, woodcraft was generally unknown to the British, but well known to the American scout Burnham. These skills eventually formed the basis of what is now called "scoutcraft", the fundamentals of Scouting. Both men recognised that wars in Africa were changing markedly and the British Army needed to adapt; so during their joint scouting missions, Baden-Powell and Burnham discussed the concept of a broad training programme in woodcraft for young men, rich in exploration, tracking, fieldcraft, and self-reliance. In Africa, no scout embodied these traits more than Burnham. It was also during this time in the Matobo Hills that Baden-Powell first started to wear his signature campaign hat like the one worn by Burnham. Later, Baden-Powell wrote a number of books on Scouting, and even started to train and make use of adolescent boys, most famously during the Siege of Mafeking, during the Second Boer War.