21 cm L/35

The 21 cm L/35 were a family of German naval guns developed in the years before World War I and used in limited numbers. This gun armed warships of Argentina, China, Denmark, Japan and The Netherlands before and after World War I. It was used in the First Sino-Japanese War, Boxer Rebellion and a ship captured by Japan in the Sino-Japanese War was later used in the Russo-Japanese War.

History
In 1886 Krupp designed the 21 cm L/35 and started production for export customers in 1890. The 21 cm L/35 was produced in two models the No.1 and No.2. The main difference between the two guns was their weight, rifling, propellant charges and muzzle velocities. Otherwise their overall length and ammunition were the same.

Naval Use
Argentina China
 * Veinticinco de Mayo - The primary armament of this protected cruiser was one, shielded, 21 cm L/35 gun fore and one, shielded, 21 cm L/35 gun aft.
 * Jingyuan-class - The primary armament of this class of two armored cruisers, Jingyuan and Laiyuan was two 21 cm L/35 guns mounted in a forward barbette.
 * Jiyuan - The primary armament of this protected cruiser was two 21 cm L/35 guns mounted in a forward barbette.
 * Zhiyuen-class - The primary armament of this class of two protected cruisers, Jingyuen and Zhiyuan was two barbette mounted 21 cm L/35 guns fore and one 21 cm L/35 gun aft.

Denmark The Netherlands
 * HDMS Valkyrien - This protected cruiser had a primary armament of one shielded 21 cm L/35 gun fore and one shielded 21 cm L/35 gun aft.
 * Evertsen-class - This class of three coastal defense ships had a primary armament of two turret mounted, No.2, 21 cm L/35 guns fore and one turret mounted 21 cm L/35 gun aft.
 * Hydra-class - This class of fourteen gunboats had a primary armament of one forward, shielded, No. 1, 21 cm L/35 gun after 1890's refits.
 * HNLMS Koningin Wilhelmina der Nederlanden - This protected cruiser had a secondary armament of one shielded, No.2, 21 cm L/35 gun aft.
 * HNLMS Reiner Claeszen - This monitor had a primary armament of one, No. 1, 21 cm L/35 gun in a forward turret.
 * HNLMS Sumatra - This protected cruiser had a primary armament of one, No. 1, 21 cm L/35 gun in a forward turret.