Following the failure of the Flămânda Offensive, the Russians began retreating, soon as north as Isaccea. The town was defended by the Romanian and Russian troops against the German offensive, but it was lost on December 24, 1916. Following its defeat, Romania signed the Treaty of Bucharest, by the term of which, Romania ceded the southern part of Dobruja to Bulgaria, while the rest (including Isaccea), was ceded to the Central Powers. The Treaty was voided by the terms of the Armistice of November 11, 1918 and Isaccea was thus returned to Romania.