In Greek tragedy, hubris is excessive human pride that challenges the gods and ultimately leads to total destruction of the offender. From the 1905 Battle of Tsushima in the Russo-Japanese War, to Hitler's 1941 bid to capture Moscow, to MacArthur's disastrous advance in Korea, to the French downfall at Dien Bien Phu, Sir Alistair Horne shows how each of these battles was won or lost due to excessive hubris on one side or the other. Making clear the danger of hubris in warfare, his insights hold resonant lessons for civilian and military leaders navigating today's complex global landscape.