noun

• (military, also attributively and figuratively)
  "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."
• (military, also attributively and figuratively)
  "Their aircraft had no belly gunners and were at the mercy of Luftwaffe fighters that attacked from below. Whenever they lifted off on a mission, they departed with the knowledge that this sortie could easily be their last."
• (by extension)
  "‘I'm just not interested in the whole class crap that seems to needle you and all the tax-payers,’ the teenager tells some ‘pre-historic monster’ of an adult, with a ‘cool’ snobbishness which MacInnes's companion on many of his Notting Hill sorties, the late Professor Richard Wollheim, compared to the ‘Sang Froid’ of Baudelaire's Dandy as he cruised through Fin-de-Siecle Paris with a similar sensibility, or lack of it."
• (by extension)

verb

• (intransitive) To carry out a sortie; to sally.
  "Five Italian warships identified as two cruisers and three destroyers, sortied down the Albanian coast during the morning of 4 March and commenced shelling the coastal road near Himara and Port Palermo, under cover of a strong fighter escort of G.50bis and CR 42s from the 24º Gruppo CT."