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A sortie (from the French word meaning exit or from Latin root surgere meaning to "rise up") is a deployment or dispatch of one military unit, be it an aircraft, ship, or troops, from a strongpoint. The term originated in siege warfare.
In military aviation, a sortie is a combat mission of an individual aircraft, starting when the aircraft takes off. For example, one mission involving six aircraft would tally six sorties. The sortie rate is the number of sorties that a given unit can support in a given time.
In siege warfare
In siege warfare, the word sortie refers specifically to a sudden issuing of troops against the enemy from a defensive position—that is, an attack launched against the besiegers by the defenders. If the sortie is through a sally port, the verb to sally may be used interchangeably with to sortie.
Purposes of sorties include harassment of enemy troops, destruction of siege weaponry and engineering works, joining the relief force, etc.
The events of these sieges show that a bold and vigorous sortie in force might carry destruction through every part of a besieger's approaches, where the guard is injudiciously disposed and ill commanded; but that if due precautions have been observed in forming the approaches and posting the defenders, any sortie from a besieged place must be checked with loss in their advance, when the approaches are still distant; or when the approaches are near, should a sortie succeed in pushing into them by a sudden rush, the assailants must inevitably be driven out again in a moment, with terrible slaughter.
- "sortie - Dictionary Definition". Vocabulary.com. Retrieved 2020-05-06.
- Ellsworth Air Force Base (AFB), Powder River Training Complex: Environmental Impact Statement. USAF. August 2010. p. (8) – 4. Retrieved 22 February 2021.
- Leif Inge Ree Petersen (2013). Siege Warfare and Military Organization in the Successor States (400-800 AD): Byzantium, the West and Islam. Leiden: Koninklijke Brill NV. p. 293. ISBN 978-90-04-25199-1.
- John Thomas Jones (1846). H.D. Jones (ed.). Journals of Sieges Carried on by the Army Under the Duke of Wellington. Vol. 2 (3rd ed.). London: John Weale. p. 331.