"The world's oldest established imperial rivalry had its start during the Napoleonic age when British agents came upon the tracks of Russian rivals in snowbound Tibet, and then again in mythic Bokhara, deep in Central Asia. Was the Tsar planning to invade India, or even worse, was Russia bent on global dominion? To foil these real or imagined schemes, the British twice invaded Afghanistan, and in 1904 dispatched an army to Lhasa to check Tsarist designs...