Retreating ice in the Alps sheds new light on high-altitude battle in World War I. Now, a century later, the warming world is revealing the buried past, as relics and corpses are melting free of their icy tombs. Italian and Austro-Hungarian troops clashed at altitudes up to 12,000 feet (3,600 meters) with temperatures as low as -22°F in the Guerra Bianca, or White War, named for its wintry theater. Never before had battles been waged on such towering peaks or in such frigid conditions. Thousands of soldiers were killed in avalanches. More than a million soldiers from both sides were killed on the Italian front, which ranged across more than 400 miles with battles lasting almost the entire length of the First World War. The long fight, much of it in the high mountains where extreme blizzards could send temperatures dropping to minus 30 degrees celsius, was between Italian forces and those of the Austro-Hungarian Empire.