Key Facts
- Year
- 49 BC
- Naval battles fought
- 2
- Siege tower height
- 6 stories, 30 ft square base
- Caesarian siege commander
- Gaius Trebonius
- Optimate defender
- Lucius Domitius Ahenobarbus
Strategic Narrative Overview
Gaius Trebonius directed the siege using towers, ramps, and a testudo-ram, while Decimus Brutus commanded the fleet. Caesar's ships won the first naval battle in late June despite being outbuilt and outnumbered. A second naval engagement in early September, after Lucius Nasidius brought Optimate reinforcements, also ended in Caesarian victory. The Massiliots mounted fierce resistance, at one point destroying siege works during a truce, but were steadily worn down.
01 / The Origins
As Julius Caesar marched toward Hispania to confront Pompey's legions, the city of Massilia (modern Marseille) closed its gates to him and allied with the Optimates under Lucius Domitius Ahenobarbus, the newly appointed proconsul of Gaul. This act of hostility compelled Caesar to begin a siege before continuing his campaign, leaving behind three newly raised legions and a fleet under trusted subordinates.
03 / The Outcome
Massilia ultimately surrendered to Caesar, who applied his characteristic clemency to the defeated city. Ahenobarbus escaped by sea to Thessaly. Massilia retained nominal autonomy and some territory due to its long ties with Rome, but Caesar confiscated the greater part of its empire, effectively ending its independence as a regional power.
Belligerents & Mobilization Analysis
Side A
1 belligerent
Gaius Trebonius, Decimus Brutus.
Side B
1 belligerent
Lucius Domitius Ahenobarbus, Lucius Nasidius.
Kinetic Engagement Axis
Scroll horizontally to view full axis. Events plotted relatively.