In October 1962, the United States and Soviet Union came to the brink of nuclear war during the Cuban Missile Crisis. The standoff occurred over the installation of nuclear missiles on Cuba, just 90 miles from the states. Though the stalemate ended after 13 grueling days, it was neither the first or last time the two world powers would very nearly come to blows.
Benjamin Franklin nailed it when he said, "Fatigue is the best pillow." True story, Benny. There's nothing like pushing your body so far past exhaustion that you'd willingly, even longingly, take a nap on a concrete slab.