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In German service, it used two shells, the 21 cm Gr 18 that weighed 113 kg (249 lb) and the 21 cm Gr 18 Be concrete-piercing shell of 121.4 kg (268 lb) with a filler of 11.61 kg (25.6 lb) of TNT. They remained in first-line use with the Germans until replaced by the 21 cm Mörser 18 by about 1940. Afterwards, they were used for training ...
The 21 cm M1880 was a heavy mortar that was designed to provide high-angle indirect fire for siege operations. It could be used to either attack or defend fortified areas. In defense, the mortar was used to provide high-angle fire to destroy enemy communications, supply, and attack trenches dug by an attacker during siege operations or it could be used by an attacker to destroy gun turrets ...