battle of Firmum

{{Infobox military conflict

| conflict = Battle of Firmum

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| partof = Social War (91-88 BC)

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| date = 90 BC

| place = Città di Fermo

| coordinates = {{coord|43|09|39|N|13|42|57|E|display=inline,title}}

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| result = Roman Victory

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| commander1 = Gnaeus Pompeius Strabo
Publius Sulpicius Rufus

| commander2 = Lafrenius{{KIA}}

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| casualties2 = Unknown

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{{Campaignbox Social War (91–88 BC)}}

The Battle of Firmum was fought between a Roman force under Gnaeus Pompeius Strabo and a rebel force led by Lafrenius.{{Cite book|title=The collapse of Rome : Marius, Sulla and the first Civil War, 91-70 BC|author=Sampson, Gareth C.|isbn=9781473826854|location=Barnsley, South Yorkshire|oclc=893910287|date = 2013-09-09}}{{Cite journal|last=Keaveney|first=Arthur|date=1983|journal=Rheinisches Museum für Philologie|volume=126|issue=3/4|pages=277|issn=0035-449X|jstor=41233487|title=Caesars in the Social War}} It took place during the Social War and was a Roman victory.

Having been defeated by a much larger rebel force at Mount Falernus and then besieged, Strabo was in a precarious situation. When he heard more rebels were approaching he launched two sallies. One was to attack the rebels head on while the other, led by Sulpicius, attacked their rear.{{Cite web|url=https://penelope.uchicago.edu/Thayer/E/Roman/Texts/Appian/Civil_Wars/1*.html|title=Appian • The Civil Wars — Book I|website=penelope.uchicago.edu|access-date=2019-12-03}} Despite successfully pulling off the manoeuvre the battle didn't turn in the Romans favour, the result remaining up in the air until some Romans managed to set fire to the rebel camp. Seeing their camp burning the rebels lost heart and fled in disorder. During the battle the rebel commander, Lafrenius, was killed. The remainder of the rebel army fled to Asculum, where Strabo would besiege the city for two years.Appian, Bellum Civile, i. 48.