Battle of the Strait of Otranto (1917)

The Battle of the Strait of Otranto of 1917 was the result of an Austro-Hungarian raid during the Adriatic Campaign of World War I on the Otranto Barrage, an Allied naval blockade of the Strait of Otranto. The battle took place on 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 naval drifters (modified fishing boats) with anti-submarine nets coupled with minefields and supported by Allied naval patrols.

Source: Wikipedia — Battle of the Strait of Otranto (1917) (CC BY-SA 4.0)