A Molotov cocktail (Finnish: Polttopullo or Molotovin koktaili, Russian: коктейль Молотова, translit. Kokteyl Molotova, German: Molotowcocktail), also known as a petrol bomb, poor man's grenade, fire bomb (not to be confused with an actual fire bomb) or just Molotov, is a generic name used for a variety of bottle-based improvised incendiary weapons. Due to the relative ease of production, they are frequently used by protesters and non-professionally equipped fighters in riots and urban guerrilla warfare. They are primarily intended to set targets ablaze rather than instantly destroy them.
The name "Molotov cocktail" was coined by the Finns during the Winter War. The name is an insulting reference to Soviet foreign minister Vyacheslav Molotov, who was responsible for the setting of "spheres of interest" in Eastern Europe under the Molotov–Ribbentrop Pact in August 1939. The pact with the Nazis bearing Molotov's name, which secretly stated the Soviet intention to invade Finland in November 1939, was widely mocked by the Finns, as was much of the propaganda Molotov produced to accompany the pact, including his declaration on Soviet state radio that bombing missions over Finland were actually airborne humanitarian food deliveries for their starving neighbours. The Finns, far from starving and engaged in a bitter war for national survival with the Soviet forces, sarcastically dubbed the Soviet cluster bombs "Molotov bread baskets" in reference to Molotov's propaganda broadcasts. When the hand-held bottle firebomb was developed to attack Soviet tanks, the Finns called it the "Molotov cocktail", as "a drink to go with the food". Molotov himself despised the name, particularly as the term became ubiquitous and generalised as Soviets faced increasing numbers of cocktail-throwing protesters in the Eastern Bloc in the years after World War II.
A Molotov cocktail is a breakable glass bottle containing a flammable substance such as petrol or a napalm-like mixture, with some motor oil added, and usually a source of ignition such as a burning cloth wick held in place by the bottle's stopper. The wick is usually soaked in alcohol or kerosene, rather than petrol.
In action, the wick is lit and the bottle hurled at a target such as a vehicle or fortification. When the bottle smashes on impact, the ensuing cloud of petrol droplets and vapour ignites, causing an immediate fireball followed by a raging fire as the remainder of the fuel is consumed. Another method is to place a reactive substance in with the petrol, and treat the label or wrapper paper with another chemical; when the bottle ruptures, the two chemicals mix and ignite. This is safer to handle if done properly, and does not betray the thrower with a visible flame prior to the throw. A far superior version can be produced by substituting carbon disulphide for the petrol and saturating this solvent with white phosphorus and sulphur. The mixture will automatically ignite on exposure to air. Care must be taken to avoid the use of rubber stoppers for the bottles, as carbon disulphide readily dissolves rubber.
Other flammable liquids such as diesel fuel, methanol, turpentine, jet fuel and E85 have been used in place of, or combined with, petrol. Thickening agents such as solvents, foam polystyrene, baking soda, tar, strips of tyre tubing, XPS foam, egg whites, motor oil, rubber cement and dish soap have been added to help the burning liquid adhere to the target and create clouds of thick, choking smoke.
Development and use in war
Spanish Civil War
Improvised incendiary devices were used for the first time in the Spanish Civil War between July 1936 and April 1939, before they became known as "Molotov cocktails". In 1936, General Francisco Franco ordered Spanish Nationalist forces to use the weapon against Soviet T-26 tanks supporting the Spanish Republicans in a failed assault on the Nationalist stronghold of Seseña, near Toledo, 40 km (25 mi) south of Madrid. After that, both sides used simple petrol bombs or petrol-soaked blankets with some success. Tom Wintringham, a veteran of the International Brigades, later publicised his recommended method of using them:
We made use of "petrol bombs" roughly as follows: take a 2lb glass jam jar. Fill with petrol. Take a heavy curtain, half a blanket, or some other heavy material. Wrap this over the mouth of the jar, tie it round the neck with string, leave the ends of the material hanging free. When you want to use it have somebody standing by with a light [i.e., a source of ignition]. Put a corner of the material down in front of you, turn the bottle over so that petrol soaks out round the mouth of the bottle and drips on to this corner of the material. Turn the bottle right way up again, hold it in your right hand, most of the blanket bunched beneath the bottle, with your left hand take the blanket near the corner that is wetted with petrol. Wait for your tank. When near enough, your pal [or comrade-in-arms] lights the petrol soaked corner of the blanket. Throw the bottle and blanket as soon as this corner is flaring. (You cannot throw it far.) See that it drops in front of the tank. The blanket should catch in the tracks or in a cog-wheel, or wind itself round an axle. The bottle will smash, but the petrol should soak the blanket well enough to make a really healthy fire which will burn the rubber wheels on which the tank track runs, set fire to the carburettor or frizzle the crew. Do not play with these things. They are highly dangerous.—Tom Wintringham, "Against Invasion – the lessons of Spain". Picture Post: 9–24. 15 June 1940.
The Battle of Khalkhin Gol, a border conflict of 1939 ostensibly between Mongolia and Manchukuo, saw heavy fighting between Japanese and Soviet forces. Short of anti-tank equipment, Japanese infantry attacked Soviet tanks with gasoline-filled bottles. Japanese infantrymen claimed that several hundred Soviet tanks had been destroyed this way, though Soviet loss records do not support this assessment.
On 30 November 1939, the Soviet Union invaded Finland, starting what came to be known as the Winter War. The Finnish Army faced large numbers of Red Army tanks. Being short on anti-tank guns, they improvised incendiary devices to use against them.
During the Winter War, the Soviet air force made extensive use of incendiaries and cluster bombs against Finnish troops and fortifications. When Soviet People's Commissar for Foreign Affairs Vyacheslav Molotov claimed in domestic propaganda broadcasts that the USSR was not bombing Finland, but merely delivering food to the starving citizens, the Finns, who were not starving, started sarcastically to call the air bombs Molotov bread baskets. Soon the Finns responded by attacking advancing tanks with "Molotov cocktails", which were "a drink to go with the food". This Finnish use of the hand- or sling-thrown explosive against Soviet tanks was repeated in the subsequent Continuation War between the two countries.
The Finns perfected the design and tactical use of the petrol bomb. The fuel for the Molotov cocktail was refined to a slightly sticky mixture of gasoline, kerosene, tar, and potassium chlorate. Further refinements included the attachment of wind-proof matches or a phial of chemicals that would ignite on breakage, thereby removing the need to pre-ignite the bottle, and leaving the bottle about one-third empty was found to make breaking more likely. As the cooling system was almost invariably placed where direct fire wouldn't hit it, the target of choice was the rear deck of a tank; the burning contents of the bottle would pour through the large cooling grills and ignite fuel, hydraulic fluids and ammunition.
A British War Office report dated June 1940 noted that:
The Finns' policy was to allow the Russian tanks to penetrate their defences, even inducing them to do so by 'canalising' them through gaps and concentrating their small arms fire on the infantry following them. The tanks that penetrated were taken on by gun fire in the open and by small parties of men armed with explosive charges and petrol bombs in the forests and villages... The essence of the policy was the separation of the AFVs from the infantry, as once on their own the tank has many blind spots and once brought to a stop can be disposed of at leisure.
Molotov cocktails were eventually mass-produced by the Alko corporation at its Rajamäki distillery, bundled with matches to light them. Production totalled 450,000 during the Winter War. The original design of the Molotov cocktail was a mixture of ethanol, tar and gasoline in a 750 millilitres (0.79 US qt) bottle. The bottle had two long pyrotechnic storm matches attached to either side. Before use, one or both of the matches was lit; when the bottle broke on impact, the mixture ignited. The storm matches were found to be safer to use than a burning rag on the mouth of the bottle.
Early in 1940, with the prospect of immediate invasion, the possibilities of the petrol bomb gripped the imagination of the British public. For the layman, the petrol bomb had the benefit of using entirely familiar and available materials, and they were quickly improvised in large numbers, with the intention of using them against enemy tanks. Although the petrol bomb might seem like a weapon of desperation, the possibility of success was not quite as distant as might be imagined. 1940 was at the very end of the era of the light tank, and the German behemoths of the later war years were still in the future: many tanks were surprisingly vulnerable.
When used in the right way and in sufficient numbers, the Finns had found that they were effective. Although the experience of the Spanish Civil War received more publicity, the more sophisticated petroleum warfare tactics of the Finns were not lost on British commanders. In his 5 June address to LDV leaders, General Ironside said:
I want to develop this thing they developed in Finland, called the "Molotov cocktail", a bottle filled with resin, petrol and tar which if thrown on top of a tank will ignite, and if you throw half a dozen or more on it you have them cooked. It is quite an effective thing. If you can use your ingenuity, I give you a picture of a [road] block with two houses close to the block, overlooking it. There are many villages like that. Out of the top windows is the place to drop these things on the tank as it passes the block. It may only stop it for two minutes there, but it will be quite effective.
Wintringham advised that a tank that was isolated from supporting infantry was potentially vulnerable to men who had the required determination and cunning to get close. Rifles or even a shotgun would be sufficient to persuade the crew to close all the hatches, and then the view from the tank is very limited; a turret-mounted machine gun has a very slow traverse and cannot hope to fend off attackers coming from all directions. Once sufficiently close, it is possible to hide where the tank's gunner cannot see: "The most dangerous distance away from a tank is 200 yards; the safest distance is six inches." Petrol bombs will soon produce a pall of blinding smoke, and a well-placed explosive package or even a stout iron bar in the tracks can immobilise the vehicle, leaving it at the mercy of further petrol bombs – which will suffocate the engine and possibly the crew – or an explosive charge or anti-tank mine.
By August 1940, the War Office produced training instructions for the creation and use of Molotov cocktails. The instructions suggested scoring the bottles vertically with a diamond to ensure breakage and providing fuel-soaked rag, windproof matches or a length of cinema film (made of highly flammable nitrocellulose) as a source of ignition.
On 29 July 1940, manufacturers Albright & Wilson of Oldbury demonstrated to the RAF how their white phosphorus could be used to ignite incendiary bombs. The demonstration involved throwing glass bottles containing a mixture of petrol and phosphorus at pieces of wood and into a hut. On breaking, the phosphorus was exposed to the air and spontaneously ignited; the petrol also burned, resulting in a fierce fire. Because of safety concerns, the RAF was not interested in white phosphorus as a source of ignition, but the idea of a self-igniting petrol bomb took hold. Initially known as an A.W. bomb, it was officially named the No. 76 Grenade, but more commonly known as the SIP (Self-Igniting Phosphorus) grenade. The perfected list of ingredients was white phosphorus, benzene, water and a two-inch strip of raw rubber; all in a half-pint bottle sealed with a crown stopper. Over time, the rubber would slowly dissolve, making the contents slightly sticky, and the mixture would separate into two layers – this was intentional, and the grenade should not be shaken to mix the layers, as this would only delay ignition. When thrown against a hard surface, the glass would shatter and the contents would instantly ignite, liberating choking fumes of phosphorus pentoxide and sulphur dioxide as well as producing a great deal of heat. Strict instructions were issued to store the grenades safely, preferably underwater and certainly never in a house. Mainly issued to the Home Guard as an anti-tank weapon, it was produced in vast numbers; by August 1941 well over 6,000,000 had been manufactured.
However, there were voices that were more cautious. There were many who were sceptical about the efficacy of Molotov cocktails and SIPs grenades against the more modern German tanks. Weapon designer Stuart Macrae witnessed a trial of the SIPs grenade at Farnborough: "There was some concern that, if the tank drivers could not pull up quickly enough and hop out, they were likely to be frizzled to death, but after looking at the bottles they said they would be happy to take a chance." The drivers were proved right, trials on modern British tanks confirmed that Molotov and SIP grenades caused the occupants of the tanks "no inconvenience whatsoever".
During the Irish War of Independence, IRA fighters sometimes used sods of turf soaked in paraffin oil to attack British army barracks. Fencing wire was pushed through the sod to make a throwing handle.
The Polish Home Army developed a version which ignited on impact without the need of a wick. Ignition was caused by a reaction between concentrated sulfuric acid mixed with the fuel and a mixture of potassium chlorate and sugar which was crystallized from solution onto a rag attached to the bottle.
In Northern Ireland during the Troubles, Molotov cocktails were used by rioting paramilitary groups and protesters against the police, and they are also used to attack houses to burn the house or to intimidate the occupants.
Molotov cocktails were also used by protesters and civilian militia in Ukraine during violent outbreaks of the Euromaidan and the 2014 Ukrainian revolution. Protesters during the Ferguson riots used Molotov cocktails, while police used smoke bombs and tear gas. 
As incendiary devices, Molotov cocktails are illegal to manufacture or possess in many regions. In the United States, Molotov cocktails are considered "destructive devices" under the National Firearms Act and regulated by the ATF.
- Improvised explosive device
- Improvised firearm
- Insurgency weapon
- Urban guerrilla warfare
- No. 73 Grenade
- No. 76 Special Incendiary Grenade
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- A Thousand Lakes of Red Blood on White Snow, a brief history of the subarctic origins of the Molotov cocktail in the Russo-Finnish Winter War of 1939–40