The Hales rifle grenade is the name for several

rifle grenade A rifle grenade is a grenade that uses a rifle-based launcher to permit a longer effective range than would be possible if the grenade were thrown by hand. The practice of projecting grenades with rifle-mounted launchers was first widely used dur ...

s used by British forces during

World War I World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, the United States, and the Ottoman Empire, with fightin ...

. All of these are based on the No. 3 design.

Operation

To fire the No. 3, the user would fit the grenade into the rifle, insert the detonator, lay the rifle on the ground in the correct position, remove the safety pin, pull back the safety pin collar, insert a special blank round into the rifle, then fire.

Operation variants

With variants that lack the vale, the grenade was activated in exactly the same way as the ones that have a vale, but the user did not need to remove the safety pin collar, as it lacks one.

History

In 1907, Frederick Marten Hale (sometimes Martin) developed the rod grenade. "A simple rod was attached to a specialized grenade, inserted into the barrel of a standard service rifle and launched using a blank cartridge." However, the British did not immediately adopt the idea and entered World War I without any rifle grenades. As soon as

trench warfare Trench warfare is a type of land warfare using occupied lines largely comprising military trenches, in which troops are well-protected from the enemy's small arms fire and are substantially sheltered from artillery. Trench warfare became ar ...

started, however, there was a sudden need for rifle grenades. The British government purchased a rodded variant of the No. 2 grenade as a temporary solution. By 1915 Hale had developed the No. 3, which is commonly known as the Hales rifle grenade.Saunders, ''Weapons of the Trench War'', p.98 The Hales grenade was improved throughout World War I to make it more reliable and easier to manufacture. However, production of the grenade was slow. In order to speed rod grenades to the front, the British also made rodded versions of the

Mills bomb "Mills bomb" is the popular name for a series of British hand grenades which were designed by William Mills. They were the first modern fragmentation grenades used by the British Army and saw widespread use in the First and Second World Wa ...

. Although a simple approach, launching a rod grenade "...placed an extreme amount of stress on the rifle barrel and the rifle itself, resulting in the need to dedicate specific rifles to the grenade launching role, as they quickly became useless as an accurate firearm. This led to the search for an alternative and resulted in the reappearance of the cup launcher during the latter years of World War I." After World War I, the rod-type rifle grenade was declared obsolete and the remaining Hales were replaced with Mills bombs shot from a rifle via a cup launcher.

Variants

The Hales went through many variations in order to make it more cost effective and effective.

No. 3

The No. 3 started off as the No. 3 Mk I. It has an externally segmented body and a wind vane designed to help activate the detonator in mid flight. It uses either Tonite or

TNT Trinitrotoluene (), more commonly known as TNT, more specifically 2,4,6-trinitrotoluene, and by its preferred IUPAC name 2-methyl-1,3,5-trinitrobenzene, is a chemical compound with the formula C6H2(NO2)3CH3. TNT is occasionally used as a reagen ...

as its explosive. The No. 3 had several problems; it was difficult to manufacture, as it required precision and was made up of many parts. Another problem occurred with the detonators; like the No. 1 grenade, the No. 3 needed a special detonator that was difficult to manufacture. This detonator was also used in the No. 2 grenade and was very similar to the one in the No. 1 grenade, which made it harder to mass-produce. Practically, the vane was a significant problem; it was hard to align properly and adverse weather, such as rain, strong winds or even a particle of dust could prevent the vane from operating correctly, which caused a failure. The No. 3 also had an overly sensitive

percussion cap The percussion cap or percussion primer, introduced in the early 1820s, is a type of single-use percussion ignition device for muzzle loader firearm locks enabling them to fire reliably in any weather condition. This crucial invention gave rise ...

, which caused many premature detonations. Once these problems became well known, further development was begun. The No. 20 was the result of these refinements.

No. 20

The No. 20 was similar to the No. 3, but its main difference was that it lacked No. 3's vane. In theory this was supposed to make it more reliable than the No. 3 and the main problem of the design was the choice of explosive used. Instead of Tonite or TNT, the No. 20 used ammonite, which tended to corrode the brass parts of the grenade, which created several failures when it was fired. While an improvement over the No. 3, the No. 20 still had design flaws, and the No. 24 was introduced to address some of the remaining problems. The No. 20 had two variants, the Mk I and II. The Mk I had a solid steel cylinder body, very similar to the No. 3, while the Mk II used a weldless steel tube and had circumferential grooves for fragmentation.Saunders, ''Weapons of the Trench War'', p.100

No. 24

The No. 24 was essentially a No. 20 with a less sensitive percussion cap and refined ammonite that did not corrode the brass parts of the grenade. There were two variants of the No. 24, the Mk I and II. The Mk I used the No. 20 Mk II's body, while the Mk II incorporated a cast iron body that has no external grooves.

No. 35

In 1918 the No. 35 was introduced. This was a No. 24 MK II that had a detonator holder that used a small arms

cartridge Cartridge may refer to: Objects * Cartridge (firearms), a type of modern ammunition * ROM cartridge, a removable component in an electronic device * Cartridge (respirator), a type of filter used in respirators Other uses * Cartridge (surname), a ...

and a shorter striker.

References

External links

More detailed look at the No 3
{{WWI British Empire small arms World War I grenades of the United Kingdom Rifle grenades 20th-century military history of the United Kingdom