Sortie

During the siege, the trapped soldiers made a daring sortie to break through the enemy lines.

Source: tatoeba (13564100)

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.

Source: wiktionary

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.

Source: wiktionary

They are vastly outnumbered: Russia is believed to fly some 200 sorties per day while Ukraine flies five to 10.

Source: wiktionary