In 2005 Wikipedia's first sentence called it “common allotrope of the chemical element phosphorus which has found extensive military application as a smoke-s”. Today it says “weapons that use one of the common allotropes of the chemical element phosphorus”.
Measured, not asserted. Every count, date and revision on this page was taken from Wikipedia's own history and checked against the live article. The words quoted are theirs.
Machine-checked against the full current article on 2026-08-03.
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The opening as it read in 2005
White phosphorus is a common allotrope of the chemical element phosphorus which has found extensive military application as a smoke-screening agent and secondarily as an incendiary weapon .1It is commonly referred to in military jargon as "WP" or "white phos".2The Vietnam War era slang Willie Pete or Wiley P is still occasionally heard.3
This is Wikipedia's own text, saved in our repository. Their copy of it is revision 17324639.
The opening as it stood in 2010 2 passages from the previous snapshot no longer appear
White phosphorus (WP) is a material made from a common allotrope of the chemical element phosphorus that is used in smoke , tracer , illumination and incendiary munitions.As an incendiary weapon, WP burns fiercely and can set cloth, fuel, ammunition and other combustibles on fire.Since WWII, it has been extensively used as an anti-personnel weapon capable of causing serious burns or death.The agent is used in bombs , artillery , and mortars , short-range missiles which burst into burning flakes of phosphorus upon impact.White phosphorus is commonly referred to in military jargon as "WP", and the slang term "Willy/Willie Pete/Peter" (dating from World War I ) is still commonly used by infantry and artillery servicemen.WP is also a highly efficient smoke producing agent, burning quickly and causing an instant bank of smoke.As a result, smoke producing WP munitions are very common, particularly as smoke grenades for infantry , loaded in defensive grenade dischargers on tanks and other armored vehicles, or as part of the ammunition allotment for artillery or mortars .These create smokescreens to mask movement from the enemy, or to mask his fire.WP burns are particularly painful, as phosphorus burns slowly and cannot be extinguished by water.
Red text was written in or rewritten since the previous snapshot. Their copy is revision 371138977.
The opening as it stood in 2015 6 passages from the previous snapshot no longer appear
White phosphorus sample White phosphorus glows when exposed to air White phosphorus is a material made from a common allotrope of the chemical element phosphorus that is used in smoke , tracer , illumination and incendiary munitions.Other common names include WP , and the slang term "Willie Pete," which is dated from its use in Vietnam, and is still sometimes used in military jargon .As an incendiary weapon, white phosphorus burns fiercely and can ignite cloth, fuel, ammunition and other combustibles.In addition to its offensive capabilities, white phosphorus is also a highly efficient smoke-producing agent, burning quickly and producing an instant blanket of smoke.As a result, smoke-producing white phosphorus munitions are very common, particularly as smoke grenades for infantry , loaded in grenade launchers on tanks and other armored vehicles, or as part of the ammunition allotment for artillery or mortars .These create smoke screens to mask movement, position, infrared signatures, or the origin of fire from the enemy.
Red text was written in or rewritten since the previous snapshot. Their copy is revision 669102962.
The opening as it stood in 2020 2 passages from the previous snapshot no longer appear
US Air Force Douglas A-1E Skyraider dropping a 100-pound M47 white phosphorus bomb on a Viet Cong position in South Vietnam in 1966.White phosphorus munitions are weapons which use one of the common allotropes of the chemical element phosphorus .White phosphorus is used in smoke , illumination and incendiary munitions, and is commonly the burning element of tracer ammunition .Other common names include WP and the slang term "Willie Pete" or "Willie Peter" derived from William Peter, the World War II phonetic alphabet for "WP", which is still sometimes used in military jargon .White phosphorus is pyrophoric (self-ignites on contact with air), burns fiercely, and can ignite cloth, fuel, ammunition, and other combustibles.In addition to its offensive capabilities, white phosphorus is a highly efficient smoke-producing agent, reacting with air to produce an immediate blanket of phosphorus pentoxide vapor.As a result, smoke-producing white phosphorus munitions are very common, particularly as smoke grenades for infantry , loaded in defensive grenade launchers on tanks and other armoured vehicles, and as part of the ammunition allotment for artillery or mortars .These create smoke screens to mask friendly forces' movement, position, infrared signatures, or shooting positions.They are often described as smoke/marker rounds due to their secondary function of marking points of interest, such as a light mortar being used to designate a target area for artillery spotters.
Red text was written in or rewritten since the previous snapshot. Their copy is revision 965065352.
The opening as it stood on October 6, 2023 2 passages from the previous snapshot no longer appear
Incendiary munition This article is about military applications.US Air Force Douglas A-1E Skyraider dropping a 45 kilograms (100 lb) M47 white phosphorus bomb on a Viet Cong position in South Vietnam in 1966 White phosphorus munitions are weapons that use one of the common allotropes of the chemical element phosphorus . White phosphorus is used in smoke , illumination , and incendiary munitions, and is commonly the burning element of tracer ammunition . Other common names for white phosphorus munitions include WP and the slang terms Willie Pete and Willie Peter , which are derived from William Peter , the World War II phonetic alphabet rendering of the letters WP .White phosphorus is pyrophoric (it is ignited by contact with air); burns fiercely; and can ignite cloth, fuel, ammunition, and other combustibles. In addition to its offensive capabilities, white phosphorus is a highly efficient smoke-producing agent, reacting with air to produce an immediate blanket of phosphorus pentoxide vapour. Smoke-producing white phosphorus munitions are very common, particularly as smoke grenades for infantry , loaded in defensive grenade launchers on tanks and other armoured vehicles, and in the ammunition allotment for artillery and mortars . These create smoke screens to mask friendly forces' movement, position, infrared signatures, and shooting positions.They are often called smoke/marker rounds for their use in marking points of interest, such as a light mortar to designate a target for artillery spotters.
Red text was written in or rewritten since the previous snapshot. Their copy is revision 1175354529.
The opening as it stood in 2025
Incendiary munition This article is about military applications. US Air Force Douglas A-1E Skyraider dropping a 100-pound (45 kg) M47 white phosphorus bomb on a Viet Cong position in South Vietnam in 1966 White phosphorus munitions are weapons that use one of the common allotropes of the chemical element phosphorus . White phosphorus is used in smoke , illumination , and incendiary munitions, and is commonly the burning element of tracer ammunition . Other common names for white phosphorus munitions include WP and the slang terms Willie Pete and Willie Peter , which are derived from William Peter , the World War II phonetic alphabet rendering of the letters WP . White phosphorus is pyrophoric (it is ignited by contact with air); burns fiercely; and can ignite cloth, fuel, ammunition, and other combustibles. White phosphorus is a highly efficient smoke-producing agent, reacting with air to produce an immediate blanket of phosphorus pentoxide vapour. Smoke-producing white phosphorus munitions are very common, particularly as smoke grenades for infantry , loaded in defensive grenade launchers on tanks and other armoured vehicles, and in the ammunition allotment for artillery and mortars . These create smoke screens to mask friendly forces' movement, position, infrared signatures, and shooting positions. They are often called smoke/marker rounds for their use in marking points of interest, such as a light mortar to designate a target for artillery spotters.
Red text was written in or rewritten since the previous snapshot. Their copy is revision 1296184374. This is our newest snapshot; the live article may have moved again since.
Today
In 2005 Wikipedia's first sentence called it “common allotrope of the chemical element phosphorus which has found extensive military application as a smoke-s”. Today it says “weapons that use one of the common allotropes of the chemical element phosphorus”. Read the current article and compare.
2005
2010
2015
2020
Oct '23
2025
Counts in the opening at each snapshot. Green: the word gained ground. Red: it was cut. Grey: no change.
What Wikipedia says this is
Every article opens by defining its subject. This one was redefined since 2005, and today's defining sentence is their current revision.
Then
common allotrope of the chemical element phosphorus which has found extensive military application as a smoke-s
Now
weapons that use one of the common allotropes of the chemical element phosphorus
Struck red text is no longer in the article; dotted amber text was rewritten. Every revision id links to Wikipedia's copy; the text shown is our own saved copy. Data: /data. Wikipedia text is CC BY-SA; quoted for the record; not affiliated with Wikipedia.