B.H. Liddell Hart is considered by some to be the Clausewitz of the 20th century, and his most important book, Strategy: The Indirect Approach, is recognized as a seminal work of military history and theory. It is widely studied in elite military institutions the world over for an understanding of the higher direction of war. Liddell Hart in this book stressed movement, flexibility, and surprise as cardinal elements of victory, which even now remain relevant to the conduct of war.