The Ordnance ML 3-inch mortar was an infantry mortar used by Great Britain during World War II, as well as the Korean War.


It was standard mortar used by the British.  Although called the '3-inch mortar' by the British Army, it's caliber was actually 3.2 in (81 mm). The launch tube was about 1.1 metres long and the entire system weighed about 57.2kg kilograms.[1] The average rate of fire was about twelve rounds per minute and the muzzle velocity of each round was about 198.1 metres per second.

The maximum range was 2,514.6 metres for the Mk II version and about half that for the Mk I version. The Ordnance ML 3 inch mortar Mk I was used since World War I and it did not have the range capabilities such as the Granatwerfer 34.[2] This caused the Mk II to be developed, and so the Mk II actually had better range than the Granatwerfer 34.

The round that the Ordnance ML3 inch mortar fired weight 4.5 kilograms and the mortar crew needed to comprise of at least three members. The optics used to sight the Ordnance ML3 inch mortar were later modified and some modifications to the base. The sights were connected to the barrel while the elevation system was put into the bipod. Besides the Mk I and Mk II differential and some minor modifications, there were no variants of the Ordnance ML 3 inch mortar.


The Ordnance ML 3 inch mortar can trace its history back to World War I with the creation and operational use of the Stokes mortar. As a refinement of the original design, the Ordnance ML 3 inch was developed in the late 1930s to serve the British military. From there, the ML 3 inch saw extensive service as the official mortar of Great Britain. Some Ordnance ML 3 inch mortar were even used in Universal Carriers. Since the Universal Carrier would've carried the ammunition, teams could set up in many different locations quickly. Among the users of the Ordnance ML3 inch mortar were Great Britain, Australia, Canada, and India.



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