Past use of avalanche warfare:

White Friday occurred during the Italian Front of World War I, when an avalanche struck an Austrian barracks on Mount Marmolada, killing 270 soldiers. Other avalanches the same day struck Italian and other Austrian positions, killing hundreds. According to some reports both sides deliberately fired shells into the weakened snowpacks in an attempt to bury the other side. Though the occurrence of avalanches in the Dolomites Mountains took place on a Wednesday in December 1916, the term 'White Friday' was used to coin the disastrous day.