The Turning Tides DLC is focused on aspects of the naval and amphibious combat during World War I. First half of the expansion includes 2 maps set during the Gallipoli Campaign: Achi Baba and Cape Helles. For the second half of the expansion 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. (wikipedia.org)