The mortar is an indirect fire weapon that rains freedom down from high angles onto an enemy within a (relatively) short range. But the compact and mobile mortar systems we have today are the result of a long history of indirect fire systems in the American military. Decades of effectively marking, lighting, and destroying targets has earned the mortar many friends — and many more enemies — on the battlefield. In short, a well-trained mortar team often means the difference between victory and defeat for infantry troops in contact.
When nature creates a successful apex predator, she rarely deviates from her original design. Warfare evolves in a similar fashion — the most successful systems are tweaked and perfected to guarantee effectiveness, preserving our way of life. This is an ode to the mortar, and all of its beautifully complex inner-workings.
Here is how a mortar system works
A noble bloodline
The mortar was born in the fires of conquest at the Siege of Constantinople in 1453. In that engagement, the new weapon proved just how effective firing explosives over short distances across an extremely high arc could be. Since that day, more than 500 years and countless wars ago, the general concept hasn't changed.
One of the biggest evolutions in the mortar design was put forth by the British in World War I: the Stokes Mortar. It had 3 sections: a 51-inch tube, a base plate, and a bi-pod. This new type of mortar system fired twenty-two 10-pound pieces of ordinance a maximum of 1,000 yards. Mortars today still use the bi-pod and base-plate improvements that were first deployed in the trenches of the Western Front.
Where the metal meets the meat
A mortar crew consists of at least three members: the squad leader, gunner, and the assistant gunner. More members could be attached depending on manpower available.
The mortar system has a large tube closed at the the bottom and attached to a base plate. Within the barrel of the tube is a firing pin used to ignite a mortar shell's primer. Some models have a moving firing pin that can be fired via a trigger mechanism.
The controlled explosion fills the chamber with gas and propels the shell out of the tube. A set of bi-pods add stability and allow on-the-fly adjustments. It can be fired from defilade (a fighting position that does not expose the crew to direct fire weapons) onto entrenched enemy not protected from overhead fire.
Sometimes referred to as a 'bomb', the shell and its components consist of the impact fuse, high explosive filler, a primary charge, fins, and augmenting charges. Illumination and smoke rounds differ depending on the model of the weapon system. Augmentation charges on the outside 'neck' near the fin can be added or removed to manipulate firing range as needed.
The gun is aimed, the round is half loaded until the 'fire' command is given and freedom rings.
Steel drizzle vs steel rain
The differences between artillery and mortars are night and day. Artillery fires on a horizontal trajectory, at faster speeds, and at longer ranges. The cost of these advantages are sacrificed in mobility.
Mortars, however, are light enough that they can be carried across difficult terrain and quickly assembled to take control of the battle space. Ammunition can be dispersed to individual troops to carry and then dropped off at the gun crew rally point.