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Self-Propelled Gun (SPG) [ 1942 ]

The Su-122 became the first dedicated assault gun for the Red Army in World War 2.

Authored By: Staff Writer | Last Edited: 01/08/2018 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site.

In June of 1941, German leader Adolph Hitler turned his attention the invasion of the Soviet Union. Though initially catching the Red Army completely by surprise, defensive lines were more-or-less stabilized and development began on systems capable of repelling any further German Army advance. One such development, intended to fight tanks and support infantry, became the SU-122. Design of the vehicle began in the summer of 1942 and the SU-122 became the first dedicated "assault gun" for the Red Army during World War 2.

By this time, the T-34 medium tank was coming into its own for the Russian armored divisions. This meant that she was in constant supply and readily available. As such, quick conversions of existing systems like the T-34 during the war became commonplace for many armies. The T-34 served as the chassis for the new assault gun design which mounted a short-barreled, low-velocity 122mm M-30 series field howitzer into a fixed superstructure. The superstructure featured sloped armor to help with ballistics protection but only allowed for slight traverse (left-right movement) of the main armament. As such, the entire vehicle would have to be pointed towards a target area for maximum effectiveness. Up to 40 x 122mm projectiles were carried aboard with no secondary machine guns for self-defense.©MilitaryFactory.com
The relatively quick conversion process allowed the SU-122 to reach front lines in late 1942. However, the short-barreled, low-velocity gun proved somewhat ineffective against German medium Panthers and heavy Tigers once in practice. Soviet engineers took to designing a new compatible projectile with a hollow charge to help the situation but the improvement was suspect at best. Where the SU-122 series did shine, however, was in support of infantry actions where its powerful 122mm high-explosive projectiles terrorized collections of enemy troops. The weapon also proved effective in dislodging or eliminating dug-in enemy positions, even those held up in fortifications. Up to March 1945, some 1,148 SU-122 examples rolled off of Soviet assembly lines and into the hands of awaiting tankers.

While the Red Army found a use for their SU-122, the series was gradually overtaken in its assault role by the newer SU-152 mounting its 152mm armament. While these two machines fulfilled the Soviet need for an assault gun, this still left them without a capable tank-fighting system, spurring the development of tracked weapons such as the SU-85 and SU-100 series soon to follow.©MilitaryFactory.com
Note: The above text is EXCLUSIVE to the site www.MilitaryFactory.com. It is the product of many hours of research and work made possible with the help of contributors, veterans, insiders, and topic specialists. If you happen upon this text anywhere else on the internet or in print, please let us know at MilitaryFactory AT gmail DOT com so that we may take appropriate action against the offender / offending site and continue to protect this original work.


Service Year

Soviet Union national flag graphic
Soviet Union


Uralsky Machine Building Factory (UZTM) - Soviet Union
(View other Vehicle-Related Manufacturers)
National flag of the Soviet Union Soviet Union
(OPERATORS list includes past, present, and future operators when applicable)
Fire Support / Assault / Breaching
Support allied forces through direct / in-direct fire, assault forward positions, and / or breach fortified areas of the battlefield.

22.8 ft
6.95 m
9.8 ft
3 m
7.6 ft
2.32 m
68,123 lb
30,900 kg
34.1 tons
(Showcased structural values pertain to the base Su-122 production variant. Length typically includes main gun in forward position if applicable to the design)
Powerplant: 1 x Model V-2-34 V12 38.9 liter diesel engine developing 500 horsepower at 1,800rpm.
34.2 mph
(55.0 kph)
186.4 mi
(300.0 km)
(Showcased performance specifications pertain to the base Su-122 production variant. Compare this entry against any other in our database)
1 x 122mm main gun

Supported Types

Graphical image of a tank cannon armament

(Not all weapon types may be represented in the showcase above)
40 x 122mm projectiles

SU-122 - Base production model
SU-122M - Modernized system featuring 122mm U-11 main gun (replacing the M-30 version of the main gun).
SU-122-III - Proposed upgrade; fitting 122mm D-6 gun to SU-85 chassis; never produced.

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Images Gallery

1 / 3
Image of the Su-122
Front left side view of an SU-122 on display
2 / 3
Image of the Su-122
Front left side view of an SU-122; note main gun traverse and elevation
3 / 3
Image of the Su-122
Front right side view of an SU-122 at rest; note sloped fixed superstructure


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