Sortie

In siege warfare, the word sortie refers specifically to a sudden sending 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,^[2] joining the relief force, etc.

Sir John Thomas Jones, analyzing a number of sieges carried out during the Peninsular War (1807–1814), wrote:^[3]

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.

In military aviation, a sortie is an aircraft flight or mission (training or combat),^[4] starting when the aircraft takes off. For example, one mission involving six aircraft would tally six sorties. The sortie rate of a unit is the number of sorties that it can support in a given time.