It was 1804. Napoleon Bonaparte stared with frustration across the English Channel toward his nemesis. Behind him was the invincible Grande Armee, nearly 200,000 crack veterans, all straining at the leash to crush the hated English. Everything was ready for the invasion: the transport barges, the escort fleet, ammunition, cavalry, artillery, ambulance wagons, even field bakeries. Every last detail had been meticulously planned. It was merely a matter or crossing the 28 miles of water in a single night's journey. Yet for month after month Napoleon paced the beach at Boulogne, hesitataing to act. Finally, after over a year of waiting, he suddenly turned his huge army around and marched it into the heart of Europe. The plan to invade England was laid aside forever. The thing that had stopped the great conqueror at the height of his career was the Royal Navy, Britain's "wall of oak." Out of sight, just over the horizon, it was nevertheless always foremost in Napoleon's doubts. And though the future Emperor's own fleet outnumbered the British, he dared not test it. That is the power of deterrence, that the true effectiveness of a strategic system is in the mind of the enemy.