 With about 30,000 Scouts and over 300,000 visitors attending, this jamboree was the largest jamboree so far.From 29 July to 12 August 1929, the third World Scout Jamboree was held at Arrowe Park, in Birkenhead, United Kingdom.This jamboree commemorated the 21st birthday of Scouting, counting from the publication of the book "Scouting for Boys" by General Baden-Powell.