As Russian Army mobilized in preparation for World War I, Žukauskas was reassigned as commander of the newly created 314th Novooskolsk Infantry Regiment which was being formed in Kursk. Until mid-October, the regiment was stationed at the Novogeorgievsk Fortress. It was then deployed in the Battle of the Vistula River and Battle of Łódź. The regiment fought near Sochaczew and Iłów. On 17 November, the regiment lost almost the entire 4th Battalion. On 20 November 1914, Žukauskas was injured in his left leg and returned to the front only in January 1915. The regiment continued to fight near Brochów and Święcieniec until 25 April.