The "Turning Tides" DLC is focused on aspects of the naval and amphibious combat during World War I. DICE released the first half of the expansion to Premium Pass holders on December 11, 2017, containing 2 maps set during the Gallipoli Campaign: Achi Baba and Cape Helles. This expansion adds six new infantry weapons to the game, as well as a new "Infiltrator" elite class, which is equipped with a heliograph spawn beacon gadget, signal flare gun, and the Martini-Henry Grenade Launcher. "Turning Tides" also brings back the Conquest Assault game mode from previous "Battlefield" installments. The L-Class Destroyer was introduced as a new naval vehicle in the DLC. For the second half of the expansion, released on January 30, 2018, "Turning Tides: North Sea" brought more locations involving naval warfare from the Great War. Two new maps were added: Heligoland Bight and Zeebrugge, along with the British Royal Marines as a new faction to battle the German Army. The "North Sea" release also introduced the C-Class Airship as a new air vehicle.