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.
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 strong point, 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.
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 intentionaly, 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.
In German 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:
Also, during the Battle of Arnhem, the Germans referred to the pocket of trapped British Paratroops as the Hexenkessel (lit. The Witches' Cauldron).
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It uses material from the
"Salients, re-entrants and pockets".
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