British Army Training Grenades

A few weeks ago I visited my friends at the Vickers Machine Gun Collection & Research Association and had a look at a variety of items you might not immediately expect to be part of their collection. The VMGCRA, however, has an extensive collection of all sorts of items and an incredible archive which they’re digitising at the moment.

Practice Mills Bombs (No.36)

Drill Grenade (Rich Fisher)

Some of the smaller items in the collection are inert training grenades. First up we have a pair of practice No.36 grenades (commonly known as Mills Bombs). Also known as Drill Grenades, these were painted entirely white and, as we can see laid out in this 1942 British Army grenade training pamphlet, they were used for throwing practice and grenade discharger cup training. They don’t have any filling but are weighted to mimic actual Mills Bombs to aid in training. Photographs of the Drill Grenades don’t appear until the post-war manuals, like this 1951-dated pamphlet which shows the white mills bombs being used in training. They were also used for general familization in classroom training and getting to grips with how the safety mechanisms worked and how fuzes were inserted. we can see an L2 grenade being used in house clearance drills in the 1979 training film Fighting In Villages

L3A1

L3A1 (Matthew Moss)

Next we have the British Army L3A1 inert practice grenade. The L3A1 practice grenade used to train troops on how to use the L2 series of live grenades. These were known as the M26 in US service and entered service in the early 1950s to replace the classic Mk2.

The grenades entered UK service in the 1970s, replacing the No.36 Mills Bomb. They were used by British troops in every major operation from the 1960s through to the 2000s. The L2 and L3 series were replaced by the L109A1 grenade during the early 2000s. The L3 was largely out of use by the mid-1990s, replaced by the L28 and L56 training grenades.

These training grenades would have been used in the classroom portion of soldiers’ training giving them hands on experience in the feel of the grenade and how the pin and spoon work and interact and where a live grenade’s fuze would be fitted. The blue painted grenades have “GREN PRAC L3A1′ and ‘HE SUB’ (high expolosive substitute) printed on them.

L111A1

L111A1 (Matthew Moss)

The UK adopted RUAG’s HG-85 in the early 2000s as the L109A1, the L110A1 is an inert drill grenade for handling practice while the L111A1, as seen here, is a practice grenade which can incorporate a small simulation charge which can be used safely in training environments. Initially called the ‘Enhanced Performance Grenade’ but once it was introduced and classified in 2002, it became the L109A1. The body of the practice L111A1 is made of steel, and is covered in a blue textured plastic material and has the words ‘PRACTICE GRENADE’ embossed near the top of the body. Like the earlier L3A1, the L111A1 approximate the weight, feel and operation of a live grenade for training purposes. The HG-85 remains the UK’s standard fragmentation grenade, here’s a video from 2021 showing the Irish Guards training with the L111A1.

So there we have it, a couple of small items from the VMGCRA but ones that illustrate the depth and breadth of the collection. Thanks for watching, don’t forget to check out and subscribe to VMGCRA! 


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Making Mills Bombs

The No.36 or Mills Bomb was one of the longest serving grenades, developed during the First World War it originated from a Belgian design by Albert Dewandre and Capitaine Léon Roland. It was improved by a British industrialist, William Mills, who owned several metal forging factories.

A No.36 Grenade (Matthew Moss)

It entered service in late 1915 as the No.5 Mk1 and continued to be improved during the war with several iterations before it finally became the No.36M Mk1. We’ll look at the Mills bombs development more closely in a future video/article – today, with the help of some 1940s newsreels from New Zealand we’re going to look at how they were manufactured. While the newsreel doesn’t state the factories featured they were made by a number of factories including Anderson Engineering in Christchurch (these were marked with an “A” below the filler plug), Booth Mcdonald, of Christchurch (marked BM), Scott Brothers, also of Christchurch (marked SB), and Mason & Porter, of Mt Wellington, in Ackland (marked MP).

William Mills’ 1916 Patent for the grenade.

In the first newsreel, courtesy of Archives New Zealand (Weekly Review No. 70 (1943)), we see No.36 grenades being cast – the newsreel takes a slightly humorous approach of describing the process as a recipe – making ‘pineapples’ – a slang name by which grenades were sometime’s known. The factory is using the sand casting method with a pattern pressed into the sand and then removed. The two halves of the grenade’s body are pressed into sand, a pressed sand core could then be placed inside which would allow the grenade’s body to be poured hollow to allow room for explosives and detonator. If we again pause here we can see a machinist is centring and counter-sinking the filling hole’s first thread for its plug.

Cast grenade bodies ready for filling (Archives New Zealand)

The footage includes a brief shot we see a woman factory worker drilling out the top of the grenade’s body and perhaps de-burring the side of the safety lever holder. In the next shot we see more machinists at work with one lady linishing the body of the grenade, removing imperfections from the casting on a grinder or polishing wheel and in the background some women a working on milling machines or drill presses. 

Women factory workers linishing the grenade body castings (Archives New Zealand)

At the very end of the film we can see the grenade bodies are stacked ready for the next phase of production. Sadly, we don’t see the threading of the filling hole or base in this film nor the painting or filling of the grenades.

In the second newsreel (Weekly Review No. 63 (1942)), however, which celebrates the production of 1 million grenades, we do seem more of the production process. In this short segment we see how the grenades are filled and how they work. We see the cast bodies of the grenades being transported on a conveyor after being shellacked to keep moisture out. If we pause here we can see this worker packing a case with “gascheck” discs and fuses.

Loading grenades, fuses and gas checks into a transit case (Archives New Zealand)

The gas check disc and a 7 second fuse was used when the grenade was being fired from a rifle’s cup discharger, while a 4 second fuse was favoured when throwing by hand. In this final clip we see the internals of a grenade – which was filled with just over 2oz of explosive through the round filling-hole (on the side opposite the safety lever) which was then screw plugged. The newsreel then concludes the grenade segment by showing the striker spring inside being compressed and a No.27 Detonator, with fuse, being inserted into the sectioned grenade.

We’ll examine more British grenades, including the No.36 in future videos and articles.


If you enjoyed this video and article please consider supporting our work here. We have some great perks available for Patreon Supporters – including custom stickers and early access to videos! Thank you for your support!


Bibliography:

Weekly Review No. 63 (1942)

Weekly Review No. 70 (1943)

W. Mills, ‘Grenade and Other Like Apparatus’, 4 Apr. 1916, US Patent #1178092, (source)

NZ Mills Grenades, Lexpev.nl, (source)

No.36 Mk1 Grenades, MillsGrenades, (source)