The Aisne is a French Marne-class aviso. She was laid down in 1916 and launched on July 21, 1917. She was commissioned in 1918. Like the Marne, she had two funnels instead of one, setting her apart from other ships of her class. On December 10, 1917, she was assigned to the First Squadron based in Brittany. In 1925, she was transferred to patrol the coast near Cherbourg. Then, in November 1934, she was assigned to patrol the coast of Brest. At the height of the Spanish Civil War, in March 1937, she was transferred to patrol the coast of the Hendaye commune. On October 17, 1938, she was decommissioned and transferred to serve as a training target. In 1943, it was combined with its sister ship, the Oise, and the armored cruiser Guidon into a single structure resembling the heavy cruiser Prinz Eugen from the sky. Notably, the enemy reconnaissance was not deceived, as the British actively tracked the position of the real cruiser.

The Aisne was introduced in Update 2.49 "Tusk Force". It is a large, dangerous ship that poses a threat to both torpedo boats and early destroyers. Its four 100mm guns can quickly destroy boats, and their high rate of fire allows them to easily inflict critical damage on destroyers. Moreover, the Aisne's durability allows it to withstand fire from torpedo boats. However, the French vessel will quickly be destroyed by bombs or torpedoes. Additionally, the Aisne has virtually no air defense because its 65 mm guns are not rapid-fire and require a direct hit on an aircraft. The Aisne differs from the Marne in that it has a unique camouflage.