The No. 77 Grenade was a Britishwhite phosphorusgrenade used during the Second World War. The No.77 was introduced in 1943 and consisted of 8 ounces of white phosphorus, an impact fuze and a tin casing. It was intended for laying down smoke screens and as signalling device. The grenade was also very effective as an anti-personnel and incendiary weapon. White phosphorus is a common allotrope of the chemical element phosphorus which has found extensive military application as an incendiary agent , smoke-screening agent, and as an antipersonnel flame compound capable of causing serious burns. ... Grenade may refer to: The well-known hand grenade commonly used by soldiers. ... Mushroom cloud from the nuclear explosion over Nagasaki rising 18 km into the air. ... The ounce is the name for a number of different units of mass (oz), and also of two units of fluid volume (fl oz) and of one unit of force, the ounce-force (ozf). ... A U.S. Army Humvee laying a smoke screen A smoke-screen is a release of smoke in order to mask the movement or location of military units such as infantry, tanks or ships. ... An anti-personnel weapon is one primarily used to injure or kill people. ... An incendiary device is a device or weapon designed to create a fire. ...