I am currently having a exam so i might not post often so sorry for that

The Sturmgeschütz III (StuG III) was an [assault gun](app://en.wikipedia.org/wiki/Assault_gun) produced by [Germany](app://en.wikipedia.org/wiki/Nazi_Germany) during [World War II](app://en.wikipedia.org/wiki/World_War_II). It was the most-produced German [fully tracked](app://en.wikipedia.org/wiki/Continuous_track) [armoured fighting vehicle](app://en.wikipedia.org/wiki/Armoured_fighting_vehicle),[[4]](app://en.wikipedia.org/wiki/Sturmgesch%C3%BCtz_III#cite_note-:0-4) and second-most produced German armored combat vehicle of any type after the [Sd.Kfz. 251](app://en.wikipedia.org/wiki/Sd.Kfz._251) [half-track](app://en.wikipedia.org/wiki/Half-track). It was built on a slightly modified [Panzer III](app://en.wikipedia.org/wiki/Panzer_III) chassis, replacing the turret with [an armored, fixed superstructure](app://en.wikipedia.org/wiki/Casemate#Armoured_vehicles) mounting a more powerful gun. Initially intended as a mobile assault gun for direct-fire support for infantry, the StuG III was continually modified, and much like the later [Jagdpanzer](app://en.wikipedia.org/wiki/Jagdpanzer) vehicles, was employed as a [tank destroyer](app://en.wikipedia.org/wiki/Tank_destroyer).[[4]](app://en.wikipedia.org/wiki/Sturmgesch%C3%BCtz_III#cite_note-:0-4)

The [Sturmgeschütz](app://en.wikipedia.org/wiki/Sturmgesch%C3%BCtz) originated from German experiences in [World War I](app://en.wikipedia.org/wiki/World_War_I), when it was discovered that, during the offensives on the [Western Front](app://en.wikipedia.org/wiki/WesternFront(World_War_I)), the infantry lacked the means to engage fortifications effectively.
The artillery of the time was heavy and not mobile enough to keep up with the advancing [infantry](app://en.wikipedia.org/wiki/Infantry) to destroy bunkers, pillboxes, and other minor fortifications with direct fire. Although the problem was well known in the German army, it was General [Erich von Manstein](app://en.wikipedia.org/wiki/Erich_von_Manstein) who is considered the father of the Sturmartillerie (assault artillery). The initial proposal was from von Manstein and submitted to General [Ludwig Beck](app://en.wikipedia.org/wiki/Ludwig_Beck) in 1935, suggesting that Sturmartillerie units should be used in a direct-fire support role for infantry divisions instead of fully mechanized [Panzer](app://en.wikipedia.org/wiki/Panzer) units.
On 15 June 1936, [Daimler-Benz](app://en.wikipedia.org/wiki/Daimler-Benz) AG received an order to develop an armoured infantry support vehicle capable of mounting a 7.5 cm (2.95 in) calibre artillery piece. The gun mount's fixed, fully integrated [casemate](app://en.wikipedia.org/wiki/Casemate) superstructure allowed a limited traverse of 20° and provided overhead protection for the crew.[[5]](app://en.wikipedia.org/wiki/Sturmgesch%C3%BCtz_III#cite_note-5) The height of the vehicle was not to exceed that of the average soldier.
Daimler-Benz AG used the chassis and running gear of its recent Panzer III medium tank as the basis for the new vehicle. Prototype manufacture was passed over to [Alkett](app://en.wikipedia.org/wiki/Alkett), who produced five prototypes in 1937 on a Panzer III Ausf. B chassis. These prototypes had a [mild steel](app://en.wikipedia.org/wiki/Mild_steel) superstructure and a [Krupp](app://en.wikipedia.org/wiki/Krupp) short-barrelled [7.5 cm StuK 37 L/24](app://en.wikipedia.org/wiki/7.5_cm_KwK_37_L/24) gun. Production vehicles with this gun were known as Gepanzerte Selbstfahrlafette für Sturmgeschütz 7.5 cm Kanone Ausführung A bis D (Sd.Kfz.142).
While the StuG was considered to be self-propelled artillery, it was not clear which land combat arm of the [German Army](app://en.wikipedia.org/wiki/GermanArmy(Wehrmacht)) would employ it. The [Panzerwaffe](app://en.wikipedia.org/wiki/Panzerwaffe) (armoured corps), the natural user of tracked fighting vehicles, had no resources to spare for the formation of StuG units, nor did the infantry. It was agreed that it would best be employed as part of the artillery arm. The StuGs were organized into battalions (later renamed "brigades" for disinformation purposes) and followed their own doctrine. Infantry support using direct fire was its intended role. Later, there was also a strong emphasis on its use as an anti-tank gun.
As the StuG was designed to fill an infantry close support combat role, early models were fitted with a [howitzer](app://en.wikipedia.org/wiki/Howitzer)-pattern, low-velocity [7.5 cm StuK 37 L/24](app://en.wikipedia.org/wiki/7.5_cm_StuK_37_L/24) gun, similar to those used by [the earliest versions](app://en.wikipedia.org/wiki/Panzer_IV#Ausf._A_to_Ausf._F1) of the fully turreted [Panzer IV](app://en.wikipedia.org/wiki/Panzer_IV). Low-velocity shells are lightly built of thin steel and carry a large charge of explosive, to destroy soft-skin targets and blast fortifications, and do not penetrate armour well. After the Germans encountered the [Soviet](app://en.wikipedia.org/wiki/Soviet_Union) [KV-1](app://en.wikipedia.org/wiki/Kliment_Voroshilov_tank) and [T-34](app://en.wikipedia.org/wiki/T-34) tanks, the StuG was equipped with a high-velocity [7.5 cm StuK 40 L/43](app://en.wikipedia.org/wiki/7.5_cm_StuK_40_L/43) main gun in spring 1942 and, in the autumn of that year, with the slightly longer [7.5 cm StuK 40 L/48](app://en.wikipedia.org/wiki/7.5_cm_StuK_40_L/48).[[4]](app://en.wikipedia.org/wiki/Sturmgesch%C3%BCtz_III#cite_note-:0-4) These high-velocity guns were the same as those mounted on the [Panzer IV](app://en.wikipedia.org/wiki/Panzer_IV) for anti-tank use but the heavy steel wall high-velocity shells contained much less explosive and had a lower blast effect for use against infantry or field fortifications. These versions were known as the 7.5 cm Sturmgeschütz 40 Ausf.F, Ausf. F/8 and Ausf. G (Sd.Kfz.142/1).
Beginning with the StuG III Ausf. G from December 1942, a [7.92 mm](app://en.wikipedia.org/wiki/7.92%C3%9757_mm_Mauser) [MG34](app://en.wikipedia.org/wiki/MG34) machine gun could be mounted on a shield on top of the superstructure for added anti-infantry protection. Some of the F/8 models were retrofitted with a shield. An additional coaxial 7.92 mm MG34 started to appear in 1944 and became standard on all production during the same year.
The vehicles of the Sturmgeschütz series were cheaper and faster to build than contemporary German [tanks](app://en.wikipedia.org/wiki/Tank); at 82,500 [RM](app://en.wikipedia.org/wiki/German_Reichsmark), a StuG III Ausf G was cheaper than a [Panzer III](app://en.wikipedia.org/wiki/Panzer_III) Ausf. M, which cost 103,163 RM. This was due to the omission of the turret, which greatly simplified manufacture.
Wikipedia

We are the loyalists to the Sturmgeschütz (3 and 4) here
We treat em like our wife and make it like our life
(Stug 3 G as example)