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Salients, re-entrants and pockets

In military terms, a salient is a battlefield feature that projects into enemy territory. Therefore, the salient is surrounded by the enemy on three sides, making the troops occupying the salient vulnerable. The enemy's line facing a salient is referred to as a re-entrant (an angle pointing inwards). A deep salient is vulnerable to being "pinched out" across the base, forming a pocket, in which the defenders of the salient become isolated.

In their topographic senses, both salient (also known as "spur") and re-entrant are familiar concepts in orienteering. A reentrant is a very small valley or draw that occurs at the head of a stream, or that begins partially up the side of a hill or ridgeline.

Salient

Salients can be formed in a number of ways. An attacker can produce a salient in the defender's line by either intentionally making a pincer movement around the flanks of a strongpoint, which becomes the tip of the salient, or by making a broad, frontal attack which is held up in the centre but advances on the flanks. An attacker would usually produce a salient in his own line by making a broad, frontal attack that is successful only in the centre, which becomes the tip of the salient.

In trench warfare, salients are distinctly defined by the opposing lines of trenches and they were commonly formed by the failure of a broad, frontal attack. The static nature of the trenches meant that forming a pocket was difficult but the vulnerable nature of salients meant that they were often the focus of attrition battles.

Examples of salients

At the Battle of Gettysburg during the American Civil War, Union General Daniel Sickles moved his III Corps ahead of the main line of the Union army without orders, causing him to be nearly cut off from the main army when the Confederates attacked. Sickles had held a similar position at Catherine's Furnace in the Battle of Chancellorsville two months earlier, and in both cases his corps was badly mauled and had to be rescued by other units.
In World War I, the British occupied a large salient at Ypres for most of the war. Formed as a result of the First Battle of Ypres, it became one of the most bloody sectors of the Western Front. So enduring was the feature and so dreadful its reputation that when British infantry spoke of "The Salient", it was understood that they were referring to Ypres.
In World War I, the Germans occupied a small salient in front of Fromelles called the Sugarloaf due to its distinctive shape. Being small it provided advantage to the occupiers by allowing them to enfilade the stretches of no man's land on either flank.
In World War II, the Soviet Union occupied a massive, 150 km deep, salient at Kursk that became the site of the largest tank battle in history.
Also in World War II, the German army made a surprise attack against advancing Allied forces in the Ardennes (a region of extensive forests primarily in Belgium and Luxembourg) in December 1944. This battle created a large salient for several weeks. The battle is commonly known as the Battle of the Bulge (the official name is Battle of the Ardennes).
During the Turkish military intervention on the island of Cyprus in 1974, Turkish Forces reached as far south as the Turkish Cypriot village of Louroujina. The cease-fire line dividing Cyprus into Greek and Turkish controlled sectors put Louroujina in a salient — accessible from the rest of Turkish Cypriot-controlled Cyprus by a single road.

Pocket

In mobile warfare, such as the German Blitzkrieg, salients were more likely to be made into pockets which became the focus of annihilation battles.

A pocket carries connotations that the encircled forces have not allowed themselves to be encircled intentionally, as they may, when defending a fortified position which is usually called a siege. This is similar to the distinction to that made between a skirmish and pitched battle.

Soviet military doctrine

The Soviet military doctrine distinguishes several sizes of encirclement: a kotel (cauldron), to reflect very large, strategic, size of trapped enemy forces; a meshok (sack) to reflect operational size of trapped enemy forces; a gnezdo (nest) to reflect a tactical size of trapped enemy forces.

The significances of these terms are reflected by the conception of what can be expected in terms of combat activity in encirclement operations. A kotel 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 meshok in Soviet experience was often created as a result of operational breakthroughs, and was sometimes unexpected as much 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 gnezdo 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).

Examples of pockets

The Hornet's Nest Pocket 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.
During Operation Barbarossa, 230,000 Soviet troops were captured in a pocket at Smolensk when isolated by the Panzer forces of General Heinz Guderian on July 20, 1941.
In 1944, following the D-Day landings, the German Seventh Army was trapped in the Falaise pocket.
In 1945, 325,000 German troops were isolated and captured by advancing American armies in the Ruhr pocket.
In the Yugoslav wars the Medak Pocket was a Serb populated area in Croatia that was invaded by Croatians in September 1993.
Breskens Pocket, on the Battle of the Scheldt during World War II
Courland Pocket, on the Eastern Front during World War II
Demyansk Pocket, on the Eastern Front during World War II

Kessel

In German the word Kessel (literally a cauldron) is commonly used to refer to an encircled military force. 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:

Battle of Stalingrad, 1942-43
Velikiye Luki Pocket 1942-1943
Korsun Pocket, 1944
Kamenets-Podolsky Pocket 1944 (aka Hube's Pocket)
Siege of Memel, 1945
Battle of Halbe, 1945
Battle of Berlin, 1945

Also, during the Battle of Arnhem, the Germans referred to the pocket of trapped British Paratroops as the Hexenkessel (lit. The Witches' Cauldron).

Motti

Motti is Finnish military slang for an encircled enemy unit, or the tactic of encircling it.

This tactic of envelopment was used extensively by the Finnish forces in the Winter War and the Continuation War to good effect. A motti is a double envelopment manoeuvre, using the ability of light troops to travel over rough ground to encircle an enemy restricted to open terrain or roads. Heavily outnumbered but mobile forces could easily immobilize an enemy many times more numerous.

The idea is to cut the enemy columns or units into smaller groups and then encircle them with light and mobile forces - such as ski-troops during winter. This turned out to be especially effective against some of the mechanized units of the Soviet Army, as they were effectively restricted to the roads. The Finnish troops on the other hand could move quickly through the forests and strike weak points. The smaller pockets of enemies could then be dealt with individually by concentrating forces against them.

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 "cook" 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.

The largest motti battles in the Winter War occurred at the Battle of Suomussalmi. Three Finnish regiments enveloped and destroyed two Soviet divisions as well as a tank brigade trapped on a road.

The word motti (originally borrowed from Swedish mått, "measure") means one cubic meter of fire- or pulpwood. When collecting timber for these purposes, the logs were cut and stacked in 1 m³ cubical stacks, which were left scattered in the woods to be picked up later.