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Yes, hand grenades were widely used in WW1
Mortars, artillery shells especially shrapnell, hand grenades and rifle grenades.
Hand grenades are made to kill enemies in trenches ,bunkers and behind covers
Hand Grenades - 1919 was released on:
USA: 16 February 1919
They were mostly motar rounds, artillery shells particularly shrapnell, hand grenades and rifle grenades.