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| 152 mm howitzer-gun M1937 (ML-20) | |
|---|---|
| Name | 152 mm howitzer-gun M1937 (ML-20) |
| Origin | Soviet Union |
| Type | Heavy artillery |
| Service | 1937–1960s |
| Used by | Soviet Union, Red Army, People's Liberation Army (China), Romanian Land Forces, Bulgarian People's Army, Czechoslovakia, Polish People's Army, Hungarian People's Army, Yugoslav People's Army |
| Designer | Motovilikha Plants |
| Design date | 1934–1937 |
| Manufacturer | Motovilikha Plants, Kamyshin, Sverdlovsk |
| Production date | 1937–1946 |
| Number | approx. 5,000 |
| Weight | 7,540 kg (in action) |
| Length | 8.5 m (overall) |
| Caliber | 152.4 mm |
| Barrel length | 39 calibers |
| Muzzle velocity | 655 m/s (HE) |
| Max range | 17.23 km (HE) |
| Carriage | split trail |
| Elevation | 0° to +65° |
| Traverse | 58° |
152 mm howitzer-gun M1937 (ML-20) was a Soviet heavy gun-howitzer combining characteristics of howitzer and gun designs to provide long-range indirect fire for the Red Army during the Second World War and early Cold War. Created at Motovilikha Plants and deployed by Artillery of the Red Army, it saw service on the Eastern Front, in the Siege of Leningrad, the Battle of Stalingrad, the Battle of Kursk, and postwar conflicts. The weapon influenced artillery doctrine in the Soviet Union and export users across the Warsaw Pact and allied states.
Design work began in the mid-1930s at Motovilikha Plants under requirements from the People's Commissariat of Defense and input from officers of the Main Artillery Directorate (GAU), seeking a dual-purpose piece to replace separate heavy guns like the 152 mm gun-howitzer M1910/37 and obsolete pieces such as the 18-pounder gun. The project drew on lessons from the Spanish Civil War reports and observations of foreign systems including the German 15 cm sFH 18 and the French Canon de 155 C modèle 1917 Schneider. Chief engineers adapted a long-barrel 152.4 mm tube on a robust split-trail carriage with hydraulic recoil and equilibrator systems, integrating production techniques from plants in Sverdlovsk and Kamyshin. Trials overseen by the GABTU and testing at the NIAP range resulted in adoption as the ML-20 in 1937.
The ML-20 combined a 152.4 mm L/39 barrel, a box trail carriage with large spades, and a hydro-pneumatic recoil mechanism derived from earlier Katyusha era engineering solutions. It weighed about 7,540 kg in firing position, with towing by heavy tractors such as the STZ-5 and later the AT-S and Ya-12 prime movers. The piece had elevation from 0° to +65° and traverse roughly 58°, allowing engagement of both counter-battery targets and fortifications like those encountered at Sevastopol and Fortress Brno. The breech used a semi-automatic interrupted screw, compatible with separate-loading charge-and-shell ammunition standardized by the GAU. Crew drills reflected procedures taught at the Frunze Military Academy and in Red Army artillery manuals.
Introduced before World War II, the ML-20 first saw combat in the Soviet invasion of Poland (1939) and in the Winter War against Finland. During the Great Patriotic War it became a mainstay of corps and army artillery, forming the backbone of heavy artillery brigades and used for counter-battery bombardment, interdiction, and direct fire against fortifications at Sevastopol, Rzhev, and Perekop Isthmus. Captured examples were used by the Wehrmacht under captured-equipment markings and evaluated at ordnance schools such as those in Wehrkreis. Postwar, ML-20s equipped forces in the Soviet occupation zone and were supplied to allies for the Korean War era and Cold War training, seeing action with North Koreaanese-aligned formations and in various Arab–Israeli conflicts via export.
Several production and field variants emerged: initial prewar series with wooden wheels for horse traction; later models fitted with steel disc wheels and pneumatic tires for motor traction influenced by requirements from the People's Commissariat of Defense mobilization plans. Self-propelled adaptations mounted ML-20 barrels on chassis such as the SU-152 and ISU-152 heavy assault guns, forming the backbone of assault artillery used in urban battles like Battle of Berlin. Experimental work considered mounting on tracked tractors and naval adaptations examined by the Soviet Navy for coastal defense. Postwar upgrades included modernized sights and towing interfaces standardized across Warsaw Pact inventories.
The ML-20 fired separate-loading, cased charges with projectiles including the 52–55 kg HE fragmentation shell, armor-piercing rounds, and chemical or smoke munitions standardized by the GAU. Effective maximum range for high-explosive rounds was about 17.23 km, with a muzzle velocity circa 655 m/s; ballistic tables used by artillery officers referenced firing data compiled at NIAP and the Artillery Academy. Ballistic performance made the ML-20 suitable for counter-battery fire against systems like the German 8.8 cm FlaK 18/36/37 when deployed in massed batteries during planned barrages by army artillery groups in operations such as Operation Bagration.
Production was concentrated at Motovilikha Plants with supplementary runs at secondary factories in Sverdlovsk and Kamyshin, totaling roughly 5,000 units through 1946 to meet demands from the Red Army and allied procurement offices. Major users included the Soviet Union, satellite states in the Warsaw Pact such as Poland, Czechoslovakia, Bulgaria, Hungary, and export recipients including People's Republic of China and North Korea. Captured examples were pressed into service by the Wehrmacht and postwar by various Yugoslav People's Army formations.
Surviving ML-20s are displayed at museums including the Central Armed Forces Museum in Moscow, the Kubinka Tank Museum, the Museum of the Great Patriotic War in Volgograd, and various military displays in Poland and China. Its design influenced later Soviet heavy artillery concepts and self-propelled gun programs studied at the Kirov Plant and doctrinal writings at the Military Academy of the General Staff of the Armed Forces of Russia. The ML-20 remains a reference point in studies of artillery tactics, World War II ordnance, and Cold War armament transfers.
Category:Field artillery Category:Soviet artillery of World War II