The No. 77 Grenade was a British white phosphorus grenade used during the Second World War. The No. 77 was introduced in 1943 and consisted of 8 ounces of white phosphorus, an impact fuse and a tin casing. It was intended for laying down smoke screens and as a signalling device. The grenade was also very effective as an anti-personnel and incendiary weapon.
Once the grenade exploded, the contents (i.e. the white phosphorus) would scatter and ignite as soon as they touched the air. This made the grenade extremely dangerous — hence its usefulness in combat.
When the war had ended, many of the grenades had become dangerous, due to corroding of the inferior tin plate steel used in the manufacture of the grenade bodies. In 1948 the grenade was determined to be obsolete and all were destroyed to minimize the danger they could have caused.
However, these were produced and used in Canada until the 1950s, for the quality and manufacturing of them was better than found in Britain.[1]
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