Mortars are 'The infantry's artillery', providing artillery-like fire support to small infantry units when artillery is either not available, or cannot be moved forward fast enough. In the U.S. Military, the typical deployment is that light 60 mm mortars are at the platoon or company level, supported by 81 mm mortars at battalion, and by the 4.2 inch mortars (now 120 mm) at regimental level.

Marine Reserve Cpl. Jason Burket positions an M252 81mm mortar during an exercise in Jaramijo, Ecuador, 10 September 2002
Marine Reserve Cpl. Jason Burket positions an M252 81mm mortar during an exercise in Jaramijo, Ecuador, 10 September 2002.

Today in WW II: 28 Jul 1941 Oil agreement between Japan and Dutch East Indies suspended, part of a general order freezing all Japanese assets, pushing Japan toward war.  More 
28 Jul 1941 Soviet Union agreement with London-based Polish Government-in-exile invalidates the border negotiated with Germany and enlists Poles detained in the USSR for Allied armies.
28 Jul 1942 6000 Jews brought to pits by German SS and shot dead in Minsk, Belarus, a total of 30,000 slaughtered over four days of the Great Pogrom [28-31 Jul].
28 Jul 1944 Rapid Red Army advance through Poland overruns German defenses and captures Brest-Litovsk, Jaroslaw and Przemysl.
28 Jul 1945 B-25 Mitchell bomber, lost in fog, crashes into 79th floor of the Empire State Building in Manhattan, causing 14 deaths and extensive damage.
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Infantry Mortars

Click on the link to go to individual Olive-Drab pages for each type of mortar:

Charactaristics of Mortars

A mortar is an indirect fire weapon that consists of a tube into which a mortar shell is dropped. The shell hits bottom on a fixed firing pin, setting off a detonation which propels the shell out with a high ballistic trajectory. Mortar rounds have fins to stabilize their flight and cause the shell to strike fuze-end first.

Since before World War II, mortars have had these components:

  • a lightweight tube
  • a bipod lifting and supporting the forward, open end of the tube
  • a relatively large base plate supporting the closed end of the tube at ground level
  • a sight, elevating and traversing mechanism, and other accessories

Light (60 mm) and medium (81 mm) mortars are portable, carried into combat by their crew. Heavy mortars are installed in custom gun carriages and are employed like artillery.

Mortars are used for battlefield illumination at night, to lay down smoke to conceal troop movements, and for anti-personnel fire using high explosive rounds. Chemical mortars have been used in the past but are not now part of the U.S. inventory.

Types of rounds for modern U.S. mortars
Types of rounds for modern U.S. mortars.

Find More Information on the Internet

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