The Kapa Kapa Trail was used by American soldiers during World War II in 1942.
Campbell wrote the book Ghost Mountain Boys, which is about soldiers who marched over the 10,000-foot Owen Stanley Mountains to protect the right flank of the Australian army during the battle for New Guinea.
In 2006, Campbell followed the footsteps of the Ghost Mountain Boys and shot a documentary film in the process.
His fascination with PNG, which he has visited five times, and the war in the South Pacific, led him to the story of the Ghost Mountain Boys.
