The first gun and its cradle was reported ready for delivery by Skoda on 28 May 1915, but it was not tested until April 1916. Shortly afterwards it was sent to the Italian Front and installed in the train yard of Calceranica al Lago near the shore of Caldonazzo lake, where it fired 122 shots before it was returned to Skoda on 30 May 1916 for refurbishing. It was nicknamed "Lange Georg" by the troops and the first task assigned was to support the Strafexpedition targeting at the Italian command center in Asiago 34 km away, where Italians believed to be out of range by artillery attacks. The operative position near the town center forced the personnel to activate a siren before shooting in order to open all the surrounding windows to prevent damages by the shock waves.