37mm Marsh Mortar
Encyclopedia
The 37mm Marsh Mortar was a compact commando mortar
Commando mortar
Commando mortar refers to a class of infantry light mortars designed for maximum portability and rapid deployment, at the expense of accuracy and repeatability....

 developed by the Iranian Army during the Iran-Iraq War
Iran-Iraq War
The Iran–Iraq War was an armed conflict between the armed forces of Iraq and Iran, lasting from September 1980 to August 1988, making it the longest conventional war of the twentieth century...

. It is very similar in concept to the WWII Soviet 37mm Spade Mortar
37mm Spade Mortar
The 37mm Spade Mortar was a Soviet 37 mm light infantry mortar used in the Second World War. The mortar was produced from 1939 until the end of 1941....

. Though not officially designated as marsh mortar, the term is used by academics in describing this mortar.

Though small for a mortar, 37mm was the maximum shell size for which recoil
Recoil
Recoil is the backward momentum of a gun when it is discharged. In technical terms, the recoil caused by the gun exactly balances the forward momentum of the projectile and exhaust gasses, according to Newton's third law...

did not drive the mortar into the soft ground.
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