High Quality Content by WIKIPEDIA articles! The Obusier de 520 modele 1916 was a French railroad gun that was built during World War I, but did not see service before the war ended. One gun was captured by the Germans after France surrendered in 1940 and used by them in the Siege of Leningrad. Both weapons were destroyed by premature detonations of shells in their barrels. hese howitzers were ordered in 1916 from Schneider et Cie, but development was protracted and the first weapon wasn't delivered until late 1917. They used a combination of cradle recoil and sliding recoil to handle the recoil forces generated by firing its enormous shells.

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