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25cm schwerer Minenwerfer

Heavy Trench Mortar

Imperial Germany | 1910

"The largest of the German Army trench mortars utilized in World War 1 was the 25cm schwerer Minenwerfer."

Authored By: Staff Writer | Last Edited: 07/31/2019 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site; No A.I. was used in the generation of this content.
The Imperial German Army enlisted several "trench mortars" during the fighting of World War 1 (1914-1918). This included the 7.58cm and 17cm minenwerfers (literally "mine launchers") but none were larger than the 25cm schwerer Minenwerfer heavy trench mortar. The system was designed during the span of 1907 to 1909 and eventually adopted in 1910. Production spanned into 1918 which increased the initial war volume from just 44 units to an impressive 1,234 by the end of the war.

Like other world military powers, the Germans observed the unfolding events of the Russo-Japanese War (1904-1905) with interest and took observations to heart when evolving their own modern doctrines. The war marked the first true conflict of the 20th century. The events of the Siege of Port Arthur (July 30th, 1904 to January 2nd, 1905) showcased the value of large-caliber siege artillery and this pushed development of like-minded systems for Germany.

A muzzle-loading design was completed in 25cm (250mm) caliber which featured a rifled barrel for accuracy at range. Recoil was aided through a hydro-spring system. A two-wheeled "box trail" carriage was used to bring the weapon into play; the actual launcher dismounted when made ready to fire. Its metal construction meant that the system weighed some 1,700lbs and required multiple crew in her operation and movement (as well as beasts of burden for her road transport). The launcher unit was given an elevation span of +45 to +75 degrees with traversal limited to 12 degrees to each side. The standard HE (High Explosive) shell was 110lbs with a heavier shell weighing 210lbs also being offered for more "stubborn" targets. Charges were loaded separately for each projectile by way of four disks. Muzzle velocity was low at 660 feet per second while effective range was out to 585 yards with a maximum reach of 1,000 yards. Sighting was through a panoramic vision assembly. Two barrel lengths were eventually developed - the original "a/A" L/3 model at 2 feet, 6 inches long and the n/A 4 L/5 model of 4 feet length.

In practice, the heavy and cumbersome 25cm unit proved highly effective thanks to its heavy shell capability. It held a rather reduced range but allowed for useful in-direct, non-line-of-sight fire which meant that the firing crew was relatively protected when set up in a sunken position such as a trench. Early successes in the field prompted a focus in manufacturing more of the type which led to a spike in general availability. These weapons proved far less expensive and maintenance-heavy than the larger German counterparts such as rail guns and heavy artillery.

In 1916, the New Model 25cm trench mortar was adopted and this brought about use of the longer L/5 barrel (n/A = "Neuer Art" or "New Model") mentioned earlier. The longer, rifled barrel increased overall effective range which, in turn, made for a more potent weapon. This led to the L3-barreled forms being recognized with the "a/A" marking for "Alter Art" ("Old Model").

25cm schwerer Minenwerfers were in use up to the end of the war in November of 1918. Afterwards, much of the German weapon capability was reduced and many forms were scrapped or taken as war prizes/reparations.

Content ©MilitaryFactory.com; No Reproduction Permitted.
The physical qualities of the 25cm schwerer Minenwerfer. Information presented is strictly for general reference and should not be misconstrued as useful for hardware restoration or operation.
750 mm
29.53 in
O/A Length
750 mm
29.53 in
Barrel Length
1,693.15 lb
768.00 kg
Not Available
Single-Shot; Reusable
Panoramic Optics.
Performance specifications presented assume optimal operating conditions for the 25cm schwerer Minenwerfer. Information presented is strictly for general reference and should not be misconstrued as useful for hardware restoration or operation.
1,771 ft
539.8 m | 590.3 yds
660 ft/sec
201 m/sec
Muzzle Velocity
Notable series variants as part of the 25cm schwerer Minenwerfer Heavy Trench Mortar family line.
25cm schwerer Minenwerfer - Base Series Designation; "a/A" old pattern model of 1910.
25cm schwerer Minenwerfer "n/A" - New Model of 1916
Global customers who have evaluated and/or operated the 25cm schwerer Minenwerfer. Nations are displayed by flag, each linked to their respective national small arms listing.

Contractor(s): Rheinmetall - Imperial Germany
National flag of the German Empire

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Image of the 25cm schwerer Minenwerfer
Image courtesy of the Public Domain.

Design Qualities
Some designs are single-minded in their approach while others offer a more versatile solution to requirements.
Some designs stand the test of time while others are doomed to never advance beyond the drawing board; let history be their judge.
Going Further...
The 25cm schwerer Minenwerfer Heavy Trench Mortar appears in the following collections:
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