In June of 1812, Napoleon set off to invade Russia with one of the largest armies the world had ever seen. Six months later, a mere fraction of Napoleon’s army --- perhaps as little as 5% --- hobbled home across the Niemen River.
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.