Battleship Danton sunk.
On 19 March 1917, while on patrol in the Tyrrhenian Sea, U-64 encountered the French battleship Danton 30 nautical miles (56 km; 35 mi) south of Sardinia. U-64 torpedoed Danton which sank in 45 minutes with the loss of 296 men.
The Danton-class battleship was a class of six pre-dreadnought battleships built for the French Navy (Marine Nationale) before World War I.