10.5 cm Luftminenwerfer M 15
Encyclopedia
The 10.5 cm Luftminenwerfer M 15 (Pneumatic Trench Mortar) was a medium mortar
Mortar (weapon)
A mortar is an indirect fire weapon that fires explosive projectiles known as bombs at low velocities, short ranges, and high-arcing ballistic trajectories. It is typically muzzle-loading and has a barrel length less than 15 times its caliber....

 used by Austria-Hungary
Austria-Hungary
Austria-Hungary , more formally known as the Kingdoms and Lands Represented in the Imperial Council and the Lands of the Holy Hungarian Crown of Saint Stephen, was a constitutional monarchic union between the crowns of the Austrian Empire and the Kingdom of Hungary in...

 in World War I
World War I
World War I , which was predominantly called the World War or the Great War from its occurrence until 1939, and the First World War or World War I thereafter, was a major war centred in Europe that began on 28 July 1914 and lasted until 11 November 1918...

. It was developed by the German firm of Ehrhardt & Sehmer. It was a rigid-recoil, muzzle-loading mortar on a fixed base that used compressed air to propel the mortar bomb to the target. Each cylinder of compressed air lasted for fifteen shots. A notable advantage was that the mortar had no firing signature, unlike conventional mortars with smoke and muzzle flash.

A batch of 25 mortars, 250 cylinders of compressed air and 10,000 complete bombs (i.e. with fuses) was ordered on 31 July 1915 for combat evaluation, but the manufacturer was unable to deliver the mortar bombs. They had to be manufactured by the Army itself. A slightly improved model was offered by Ehrhardt & Sehmer at the end of March 1916, but it was rejected because of the poor range of the ammunition and the difficulty in procuring it.

Ten trench mortar platoons, each with two weapons, were formed and deployed in February 1916, mainly to the Russian theater.
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