A relief army had the task of relieving or freeing a
besieged city, town, fortress or castle.
Often relief had to be sought by sending a messenger out through the siege lines to deliver a request for help from allies or friendly forces. Well-known examples include:
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Gallic Wars
The Gallic Wars were waged between 58 and 50 BC by the Roman general Julius Caesar against the peoples of Gaul (present-day France, Belgium, and Switzerland). Gauls, Gallic, Germanic peoples, Germanic, and Celtic Britons, Brittonic trib ...
, see
Caesar
Gaius Julius Caesar (12 or 13 July 100 BC – 15 March 44 BC) was a Roman general and statesman. A member of the First Triumvirate, Caesar led the Roman armies in the Gallic Wars before defeating his political rival Pompey in a civil war. He ...
''de bello Gallico'' and
Vercingetorix
Vercingetorix (; ; – 46 BC) was a Gauls, Gallic king and chieftain of the Arverni tribe who united the Gauls in a failed revolt against Roman Republic, Roman forces during the last phase of Julius Caesar's Gallic Wars. After surrendering to C ...
, 52 B. C. or the
Battle of Alesia
The Battle of Alesia or siege of Alesia (September 52 BC) was the climactic military engagement of the Gallic Wars, fought around the Gauls, Gallic ''oppidum'' (fortified settlement) of Alesia (city), Alesia in modern France, a major centre ...
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Siege of Paris (885–86)
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Fall of Constantinople
The Fall of Constantinople, also known as the Conquest of Constantinople, was the capture of Constantinople, the capital of the Byzantine Empire by the Ottoman Empire. The city was captured on 29 May 1453 as part of the culmination of a 55-da ...
– here the relieving fleet arrived too late.
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Second Turkish Siege of Vienna (1683)
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Military terminology