Sinking of Aboukir, Hogue and Cressy
22 September 1914, Broad Fourteens, southern North Sea
German victory
Three old armoured cruisers, known in the fleet as the 'live-bait squadron', were patrolling slowly in line without destroyers. The small submarine U-9 torpedoed Aboukir; Hogue and Cressy stopped to pick up survivors and were torpedoed in turn. All three sank within an hour, with 1,459 men. It showed the world what a submarine could do.
Read more on WikipediaRoyal Navy
3 ships, 3 lost
Imperial German Navy
1 ship, none lost