🛠️ Invention or technique

Fragmentation hand grenade with safety pin (Mills bomb)

Granada de fragmentación con anilla de seguridad (Mills)

Date
1915 · confidence high
Place
Birmingham, England, United Kingdom
Credited to
William Mills
Field
Conflict

What it is

A grenade with a serrated iron body, safety lever and seven-second delay that scattered fragments tens of metres. It was the standard hand grenade of the British and Commonwealth armies for over half a century.

Mills patented the design in 1915 (No. 5), after the Hale grenade and other models; the novelty was combining the serrated body with the safety lever and delay.

What it led to

  • trench warfare and assaults on positions
  • modern pin-safety grenades
  • rifle and launcher grenades
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Sources✓ verified 2026-11-04