
Grenades 1914 -1922
Grenades have been part of European warfare since the C17th. The word 'grenade' is derived from the french for pomegranate. The earliest types of grenade were simple earthenware pots filled with blackpowder and ignited using matchcord. By the time of the Franco-Prussian War the grenade had evolved into a mechanical device ignited by a friction fuse. In 1914 the French still had vast stocks of these older types of grenade and they formed the backbone of supplies until the adoption of more modern designs in around 1916.
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The French Boule (ball) Grenade 1914
The ball grenade was a reworked example of the type of grenade used in the Franco-Prussian war. It featured an improved fuse system and was projected by and infantryman wearing a leather wrist-strap which in turn clipped on to a ring on top of the grenade (see image). Upon releasing the grenade the strap would automatically remove the ring and thus priming the fuse.
Citron (lemon) Foug Grenade, 1916
A practical and compact grenade. The segmentation was designed solely for ease of gripping the grenade. The fuse was triggered by removing the safety cover and striking the pin sharply against a hard surface (such as your Adrian steel helmet!). The grenade was capable of being filled with anything from phosphorous for smoke to gas and high explosive.
The F1 Grenade - Three Variants
The F1 was the world's first truly modern grenade. From the left, we have the first pattern which was a rough cast casing and the red cover would be removed to reveal a plunger which once struck activated the grenade's fuse. In the centre is the second pattern with improved casting to the body and improved (shorter) fuse. The third image is the final pattern and of a type more familiar to modern eyes, this is activated by removing the pin and only once the grenade is released will the spring-loaded spoon handle detach arming the fuse.

The Viven et Bessières Grenade, 1916
The VB grenade is unique, it was designed solely as a rifle grenade and is propelled by placing it flat-side down into a special adaptor which fits on to the end of the Lebel rifle (The adaptor will in fact fit any French rifle from the Lebel onwards, however the Lebel's design meant it was the only gun strong enough to be used for the VB's discharge). The adaptor is known as the tromblon which translates into english as blunderbuss! The maximum range of this grenade was 170 - 190 metres (depending which source you believe)
Please note that these images are not to the same scale