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A pocket refers to combat forces that have been isolated by opposing forces from their logistical base and other friendly forces. In mobile warfare, such as the German Blitzkrieg, salients were more likely to be cut off into pockets, which became the focus of battles of annihilation.
A pocket carries connotations that the encirclement was not intentionally allowed by the encircled forces, as it may have been when defending a fortified position, which is usually called a siege. This is a similar distinction to that made between a skirmish and pitched battle.
Soviet military doctrine
Soviet military doctrine distinguishes several sizes of encirclement:
- Cauldron or kettle (Russian: котёл, translit. kotyol or kotel): a very large, strategic-level concentration of trapped enemy forces
- Sack (Russian: мешок, translit. meshok): an operational-level trapped enemy force
- Nest (Russian: гнездо, translit. gnezdo): a tactical-level trapped enemy force
The significance of these terms are reflected by the conception of what can be expected in combat in encirclement operations. A cauldron is expected to be "boiling" with combat activity, the large enemy forces still quite able to offer "hot" resistance in the initial stages of encirclement, and so are to be contained, but not engaged directly. A sack in Soviet experience was often created as a result of operational breakthroughs, and was sometimes as unexpected for the Soviet command as for the enemy. This encirclement, sometimes of an entity of unknown size, tended to move for some time after the initial encirclement due to inherently dynamic nature of operational warfare. By contrast a nest was a reference to a tactical, well-defined and contained encirclement of enemy troops that was seen as a fragile construct of enemy troops unsupported by its parent formation (the use of the word nest is similar to the more familiar English expression machine gun nest).
In German the word Kessel (literally a cauldron) is commonly used to refer to an encircled military force, and a Kesselschlacht (cauldron battle) refers to a pincer movement. The common tactic which would leave a Kessel is referred to Keil and Kessel (Keil means wedge). The term is sometimes borrowed for use in English texts about World War II. Another use of Kessel is to refer to Kessel fever, the panic and hopelessness felt by any troops who were surrounded with little or no chance of escape. Examples of Kessel battles are:
- Demyansk Pocket, 1942
- Battle of Stalingrad, 1942–43
- Velikiye Luki Pocket, 1942–1943
- Second Battle of Kharkov, 1943
- Korsun Pocket, 1944
- Kamenets-Podolsky pocket 1944 (aka Hube's Pocket)
- Siege of Memel, 1945
- Battle of Halbe, 1945
- Battle of Berlin, 1945
In Spanish the word Cerco (literally a fence or siege) is commonly used to refer to an encircling military force. Cercos were particularly common in the Chaco War between Bolivia and Paraguay (1932–1935) and encirclement battles were decisive for the outcome of the war. In the Campo Vía pocket 7,500 Bolivians were taken prisoner out of an initial combat force of 10,000. Other cercos of the war include the battle of Campo Grande and the battle of Cañada Strongest.
Motti is Finnish military slang for a totally encircled enemy unit. The tactic of encircling it is called motitus, literally meaning the formation of an isolated block or "motti", but in effect meaning an entrapment or envelopment.
The word means "mug" in many Finnish dialects; motti is thus related to kessel. A motti in military tactics therefore means the formation of "bite sized" enemy units which are easier to contain and deal with.
This tactic of envelopment was used extensively by the Finnish forces in the Winter War and the Continuation War to good effect. It was especially effective against some of the mechanized units of the Soviet Army, which were effectively restricted to the long and narrow forest roads with virtually no way other than forwards or backwards. Once committed to a road, the Soviet troops effectively were trapped. Unlike the mechanized units of the Soviets, the Finnish troops could move quickly through the forests on skis and break columns of armoured Soviet units into smaller chunks (e.g., by felling trees along the road). Once the large column was split up into smaller armoured units, the Finnish forces attacking from within the forest could strike the weakened column. The smaller pockets of enemy troops could then be dealt with individually by concentrating forces on all sides against the entrapped unit.
A motitus is therefore a double envelopment manoeuvre, using the ability of light troops to travel over rough ground to encircle enemy troops on a road. Heavily outnumbered but mobile forces could easily immobilize an enemy many times more numerous.
By cutting the enemy columns or units into smaller groups and then encircling them with light and mobile forces, such as ski-troops during winter a smaller force can overwhelm a much larger force. If the encircled enemy unit was too strong, or if attacking it would have entailed an unacceptably high cost, e.g., because of a lack of heavy equipment, the motti was usually left to "stew" until it ran out of food, fuel, supplies, and ammunition and was weakened enough to be eliminated. Some of the larger mottis held out until the end of the war because they were resupplied by air. Being trapped, these units were therefore not available for battle operations.
In World War II
- From June to December 1941, during Operation Barbarossa,
- Almost the entire Soviet Western Front was encircled and destroyed by the Germans in the Battle of Bialystok-Minsk.
- Later, 230,000 Soviet troops were captured in a pocket at Smolensk when isolated by the Panzer forces of Generals Heinz Guderian and Hermann Hoth on August 5, 1941.
- During the Siege of Odessa, German and Romanian forces encircled and captured thousands of Soviet troops.
- At the end, most of the Soviet Southwestern Front (about 450,000 soldiers) was encircled in the First Battle of Kiev.
- In the winter of 1942, thousands of German troops were encircled in the Demyansk Pocket in northwestern Russia, but were relieved the following spring.
- In the winter of 1942, 5,500 German troops were encircled by the Soviets in the Kholm Pocket.
- In the spring of 1942, thousands of Soviet troops engaged in an offensive thrust were encircled during the German counterattack in the Second Battle of Kharkov.
- In November 1942, during the Battle of Stalingrad, nearly all of the German Sixth Army was encircled and destroyed in Operation Uranus. The Italian Army in Russia and Second Army (Hungary) were similarly eliminated during Operation Little Saturn.
- In May 1944, nearly half the German and Romanian garrison in modern Crimea were captured during the Crimean Offensive, primarily in Sevastopol.
- In June and July 1944, over 500,000 German troops were killed or captured during Operation Bagration in modern Belarus.
- In August 1944, over 800,000 German and Romanian troops were overrun in the second Jassy-Kishinev Offensive in modern Romania.
- In September 1944, following the D-Day landings, the German Seventh Army was trapped in the Falaise pocket.
- In 1944, thousands of Germans troops were encircled by a mostly Canadian force in the Breskens Pocket during the Battle of the Scheldt.
- In winter of 1944–1945, a large number of German troops was isolated in the Courland Pocket in northwestern Latvia until the end of the war.
- Also during the winter of 1944–1945, nearly 300,000 German troops were overrun in the Vistula-Oder Offensive in modern Poland.
- In 1944–1945, 180,000 German and Hungarian troops were isolated by Soviet troops in the Siege of Budapest.
- In 1945, 325,000 German troops were isolated and captured by advancing American armies in the Ruhr pocket.
- In April and May 1945, over 750,000 German troops were encircled and destroyed in the Battle of Berlin and collapse of the Third Reich.
- Finally in August 1945, over 400,000 Japanese and Manchurian troops were encircled over a broad area during the Soviet invasion of Manchuria.
- The Hornet's Nest at the Battle of Shiloh in the US Civil War, where two Union divisions were surrounded, cut off from the rest of the army, and held out against ferocious Confederate attacks for six hours before surrendering.
- Campo Vía in the Chaco War.
- In the Yugoslav wars the Medak Pocket was a Serb-populated area in Croatia that was invaded by Croatians in September 1993.
- In the war in Donbass, Ukrainian troops were encircled at Ilovaisk in August 2014, suffering heavy material and human losses.
- Hayward 1997, p. 24.
- Adam, Wilhelm; Ruhle, Otto (2015). With Paulus at Stalingrad. Translated by Tony Le Tissier. Pen and Sword Books Ltd. pp. 18, 22. ISBN 9781473833869.
- Oldwitg von Natzmer. Operations of Encircled Forces. German Experiences in Russia. — Department of the Army, Washington, DC 1952. (Oldwitg von Natzmer). Washington DC. 1952
- Hastings, M. (2006) . Overlord: D-Day and the Battle for Normandy (reprint ed.). New York: Vintage Books USA. p. 313. ISBN 0-307-27571-X.
- Tout, Ken. (2003). In the Shadow of Arnhem (Paperback 2009, ISBN 9780752451947)
- Mitcham, Samuel W. (2001). Crumbling Empire: The German Defeat in the East, 1944. Westport, CT: Praeger. p. 65. ISBN 978-0-275-96856-4.
- "Battlefield Manchuria – The Forgotten Victory", Battlefield (documentary series), 2001, 98 minutes.
- Cunningham, O. Edward (2007). Joiner, Gary; Smith, Timothy, eds. 'Shiloh and the Western Campaign of 1862. New York: Savas Beatie. p. 298. ISBN 978-1-932714-27-2.
- de Quesada, Alejandro (2011). The Chaco War 1932-35: South America’s greatest modern conflict. Osprey Publishing. ISBN 9781849084161.
- "Consolidated Indictment". The Prosecutor v. Rahim ADEMI and Mirko NORAC. International Criminal Tribunal for the Former Yugoslavia. 27 May 2004. Retrieved 20 April 2012.
- "More Ukrainian soldiers killed as fighting rages in east, peace move flops". Reuters. 16 July 2014. Retrieved 16 July 2014.
- Hayward, Joel (Spring 1997). "Stalingrad: An Examination of Hitler's Decision to Airlift" (PDF). Airpower Journal. 11 (1): 21–37.
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- The Great Kitilä Motti (Winter War history from a documentary film's website)