The 42-centimetre kurze Marinekanone 14 L/12 (short naval cannon), 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. The M-Gerat had a 42 cm (17 in) calibre barrel, making it one of the largest artillery pieces ever fielded.
The M-Gerat 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. Test firing began in early 1914 and the gun was estimated to be finished by October 1914. When the First World War broke out, the two M-Gerat guns, still prototypes, were sent to Liege, Belgium, and destroyed Forts Pontisse and Loncin. 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. The Paris Gun, a railway gun used to bomb Paris in 1918, has historically been confused for the M-Gerat.
Due to losses from faulty ammunition and Allied counter-battery artillery, a smaller-calibre (30.5 cm (12.0 in)) gun called the Beta-M-Gerat was built and fielded from 1916 until the end of the war. It had a longer and heavier barrel that was mated to the M-Gerat's carriage but was found to be less effective than the base gun.
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