15 cm sFH 18

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15 cm sFH 18
Preserved sFH 18 howitzer at CFB Borden
Type	howitzer
Place of origin	Germany
Service history
In service	1918–1970
Used by	Germany Finland
Wars	World War II
Production history
Designer	Krupp
Designed	late 1920s
Manufacturer	Krupp, Rheinmetall, Spreewerke, M.A.N. and Skoda
Produced	1933
Specifications
Weight	5,530 kg
Barrel length	L/30

Shell	149 mm × 260 R (cased separate-loading ammunition)
Caliber	149.1 mm
Breech	interrupted screw
Recoil	hydropneumatic
Carriage	split trail
Elevation	−3 degrees, +45 degrees
Traverse	+/-30 degrees
Muzzle velocity	515 m/s
Maximum range	13 km

The 15 cm schwere Feldhaubitze 18 or sFH 18 (German: "heavy field howitzer, model 18"), nicknamed Immergrün ("Evergreen"), was the basic German division-level heavy howitzer during the Second World War, serving alongside the smaller but more numerous 10.5 cm leFH 18. It was based on the earlier, First World War-era design of the 15 cm sFH 13, and while improved over that weapon, it was generally outdated compared to the weapons it faced. It was, however, the first artillery weapon equipped with rocket-assisted ammunition to increase range. The sFH 18 was also used in the self-propelled artillery piece Schwere Panzerhaubitze 18/1 (more commonly known as Hummel).

The sFH 18 was one of three 15 cm (6 inch) calibre weapons, the others being the 15 cm Kanone 18, a corps-level heavy gun, and the 15 cm sIG 33, a short-barrelled infantry gun.

1 Design and development
2 Versions
3 Operators
4 References
5 See also

[edit] Design and development

The gun originated with a contest between Rheinmetall and Krupp, both of whom entered several designs that were all considered unsatisfactory for one reason or another. In the end the army decided the solution was to combine the best features of both designs, using the Rheinmetall gun on a Krupp carriage.^[1]

The carriage was a relatively standard split-trail design with box legs. Sand shovels were carried on the sides of the legs that could be slipped onto the ends for added support. The carriage also saw use on the 10.5 cm sK 18 gun. As the howitzer was designed for horse towing, it used an unsprung axle and hard rubber tires. A two-wheel bogie was introduced to allow it to be towed, but the lack of suspension made it unsuitable for towing at high speed. The inability of heavy artillery like the sFH 18 to keep up with the fast-moving tank forces was one of the reasons that the Luftwaffe invested so heavily in dive bombing, in order to provide a sort of "flying artillery" for reducing strongpoints.

The gun was officially introduced into service on 23 May 1935,^[2] and by the outbreak of war the Wehrmacht had about 1,353 of these guns in service. Production continued throughout the war, reaching a peak of 2,295 guns in 1944.^[2] A total of 5,403 sFH 18's were produced.^[3]

In the field, the sFH 18 proved to be greatly inferior to the Red Army 122 mm A-19 gun-howitzer, whose maximum range of 20 km allowed it to fire counter-battery against the sFH 18 with a seven km advantage. This led to numerous efforts to introduce new guns with even better performance than the A-19, while various experiments were also carried out on the sFH 18 to improve its range. These led to the 15 cm sFH 18M version with a removable barrel liner and a muzzle brake that allowed a larger "special 7" or 8 charge to be used. The 18M increased range to 15,100 m, but it was found that the liners suffered increased wear and the recoil system could not handle the increased loads in spite of the brake. This led to a more interesting modification, the introduction of the 15 cm R. Gr. 19 FES ammunition, which used a rocket-assisted round that could reach 18,200 m and give it some level of parity with the A-19.

Several other versions of the basic 15 cm were produced. The 15 cm sFH 36 was a version with a greatly reduced 3,450 kg weight that was an attempt to improve mobility, but as it used various light alloys to achieve this savings it was considered too costly to put into production. The 15 cm sFH 40 was another improved version, featuring a slightly longer barrel and a new carriage that was suitable for vehicle towing and allowed the barrel to have wider firing angles and thereby improve range up to 15,400 m. However this version was even heavier than the sFH 18 (at 5,680 kg) and was found to be too difficult to use in the field. Some of these barrels were later fitted to existing sFH 18 carriages, creating the sFH 18/40. A further modification was the FH 18/43, which changed to a split breech that allowed for the use of bagged charges instead of requiring the gunners to first put the charges into shells. Two further attempts to introduce a newer 15 cm piece followed, but neither the 15 cm sFH 43 or 15 cm sFH 44 progressed past the stage of wooden mock-ups.^[4]

Several countries continued fielding the sFH 18 after the war in large numbers including Czechoslovakia, Portugal and many South American and Central American countries. Finland bought 48 sFH 18 howitzers from Germany in 1940 and designated them 150 H/40.

[edit] Versions

15 cm sFH 18 - standard version
15 cm sFH 18M - modification of sFH-18 with muzzle brake and replaceable barrel liner
15 cm sFH 18/40 - sFH 40 barrels on sFH 18 carriages
15 cm sFH 18/43 - a sFH 18 development to accept bag charge with sliding-block breech