Hard to believe now, but the French army was widely considered the greatest in the world at the beginning of 1940. It is painful and eye-opening to see how quickly it was punctured, deflated, and slashed to ribbons by a smaller but infinitely better armed and trained German force in May and June of that year. This book paints an excellent picture of how inferior doctrine (static defense as opposed to fast-moving armor attacks) can absolutely wreck an army. Poor France. She lost so many men in World War I and then learned all the wrong lessons as a result.