The F-1 grenade is a hand grenade mass-produced by France during and after WW1, used en masse in the majority of European countries throughout the First and Second World Wars.
The F-1 grenade was first put into mass production by the French State in 1915 during the First World War. In May 1915 the first of the F1 grenades (fusante No. 1) appeared in the French military, in limited quantities. This new weapon inherited from the experience of the first months of the war: the shape was made to be more modern, with an external grooves pattern for better grip and easier fragmentation. The second expectation proved deceptive, since the explosion in practice gave no more than 10 fragments (although the pattern was designed to split into all the 38 drawn divisions). The design was proved to be very functional, especially due to its stability compared to other grenades of the same period. Later, the Fusante No. 1 was used en masse by many foreign armies in the period 191