Strait of Otranto
The Battle of the Strait of Otranto of 1917 was the result of an Austro-Hungarian raid on the Otranto Barrage, an Allied naval blockade of the Strait of Otranto. The battle took place on 14–15 May 1917, and was the largest surface action in the Adriatic Sea during World War I. The Otranto Barrage was a fixed barrier, composed of lightly armed drifters with anti-submarine nets coupled with minefields and supported by Allied naval patrols.