Near the end of the Second World War, the United States made a bold strategic gambit that rewired the international system. Empires were abolished and replaced by a global arrangement enforced by the U.S. Navy. With all the world's oceans safe for the first time in history, markets and resources were made available for everyone. Enemies became partners. We think of this system as normal—it is not. We live in an artificial world on borrowed time.

The revised and updated edition of Lt. Col. Dave Grossman's modern classic about the psychology of combat, hailed by the Washington Post as "an illuminating account of how soldiers learn to kill and how they live with the experiences of having killed". In World War II, only 15 to 20 percent of combat infantry were willing to fire their rifles. In Korea, about 50 percent. In Vietnam, the figure rose to more than 90 percent. The good news is that most soldiers are loath to kill.

Historians universally agree that Thucydides was the greatest historian who has ever lived, and that his story of the Peloponnesian conflict is a marvel of forensic science and fine literature. That such a triumph of intellectual accomplishment was created at the end of the fifth century B.C. in Greece is, perhaps, not so surprising, given the number of original geniuses we find in that period. But that such an historical work would also be simultaneously acknowledged as a work of great literature and a penetrating ethical evaluation of humanity is one of the miracles of ancient history.

The title “Bullfrog” is given to the Navy SEAL who has served the longest on active duty. Admiral McRaven was honored to receive this honor in 2011 when he took charge of the United States Special Operations Command. When McRaven retired in 2014, he had 37 years as a Navy SEAL under his belt, leading men and women at every level of the special operations community. During those four decades, Admiral McRaven dealt with every conceivable leadership challenge. The Wisdom of The Bullfrog draws on these and countless other experiences from Admiral McRaven’s incredible life.

January 1991: IRAQ. Eight members of the SAS regiment embark upon a top-secret mission to infiltrate deep behind enemy lines. Under the command of Sergeant Andy McNab, they are to sever a vital underground communication link and to seek and destroy mobile Scud launchers. Their call sign: BRAVO TWO ZERO. Each laden with 15 stones of equipment, they tab 20km across the desert to reach their objective. But within days, their location is compromised. After a fierce fire fight, they are forced into evasive action. Four men are captured. Three die. Only one escapes.