sentences:  Division Posen 2 initially served on the Eastern Front, fighting in Poland, including at the 1914 Battle of Łódź, and then spent most of the period until mid-1915 fighting along the Rawka and Bzura Rivers.On June 2, 1915, it became the 84th Infantry Division.It fought around Warsaw in July and August 1915 and then in the pursuit of retreating Russian forces.