On November 11, 1940...
In one of the boldest actions in modern military history, a handful of Fairey Swordfish biplanes took off from two British carriers and struck the Italian Fleet at Taranto. Half of the battleships in that fleet were sunk or crippled, while the British losses – two biplanes – were remarkably modest. The entire strategic position in the Mediterranean Sea changed in one hour.
Apologies to my left-leaning friends for link. Please ignore any offensive ads that pop up, and everything past the sentence "There are lessons we can learn today." is quite up for grabs in my opinion.
Battle of Taranto (wikipedia).