
The Paris Gun, a railway gun used to bomb Paris in 1918, has historically been confused for the M-Gerät.ĭue to losses from faulty ammunition and Allied counter-battery artillery, a smaller-calibre (30.5 cm (12.0 in)) gun called the Beta-M-Gerät was built and fielded from 1916 until the end of the war. German soldiers bestowed the gun with the nickname "Big Bertha", which then spread through German newspapers to the Allies, who used it as a nickname for all super-heavy German artillery. When the First World War broke out, the two M-Gerät guns, still prototypes, were sent to Liège, Belgium, and destroyed Forts Pontisse and Loncin. Test firing began in early 1914 and the gun was estimated to be finished by October 1914. The M-Gerät designed in 1911 as an iteration of earlier super-heavy German siege guns intended to break modern fortresses in France and Belgium and entered production in 1912. The M-Gerät had a 42 cm (17 in) calibre barrel, making it one of the largest artillery pieces ever fielded.

The 42-centimetre kurze Marinekanone 14 L/12 (short naval cannon), or Minenwerfer-Gerät ( M-Gerät), popularly known by the nickname Big Bertha, was a German siege howitzer built by Krupp AG in Essen, Germany and fielded by the Imperial German Army from 1914 to 1918. Model of an M-Gerät at the Musée de l'ArméeĨ shells an hour or 1 shell per 7.5 minutes
