Robert Baden-Powell
Robert Baden-Powell OM, GCMG, GCVO, KCB was a lieutenant-general in the British Army, and, famously, the founder of the Scout Movement. He served in the British Army from 1876-1910 in India and Africa, and these experiences served as the basis for many of his writings on military tactics, training, doctrine and scouting techniques. His book Scouting for Boys is the fourth bestselling book of all time.
