On this day in Military history...

1918  Second battle of Villiers-Bretonneux Germans using tanks and mustard gas defeat the British 8th infantry defending the town.

1941 German paratroopers land on Greek islands, British start evacuations to Egypt & Greece.

1980 An ill-fated USA military operation trying to rescue 80 hostages in Iran resulted in a crashed helicopter and 8 USA servicemen killed in operation Claw.