Anthony Joseph Drexel Biddle Sr. was an eccentric millionaire and an amateur boxer, he was also a pioneer of combatives in the United States of America. He began his career with the Marine Corps as an instructor of bayonet tactics during World War I. Biddle was also one of the biggest promoters of W.E. Fairbairn's Defendu during the interwar period and taught Marines and G-men hand-to-hand fighting tactics up until the end of World War II. This book presents an overview of the man's story and his system.