"The Campaign in Italy, September-december 1943- the Allied Advance To the Gustav Line" The Volturno River 12 - 16 October 1943: A 25 pounder self-propelled gun at an aerodrome near Grazzanise fires a round during the night barrage in preparation for the crossing of the Volturno by assault troops. The gun is mounted on the wreckage of a German aircraft to obtain more elevation.