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| Siege of Massilia | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Part ofCaesar's Civil War | |||||||||
 Map of the siege | |||||||||
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| Belligerents | |||||||||
| Supporters ofJulius Caesar | City of Massilia Supporters ofPompey | ||||||||
| Commanders and leaders | |||||||||
| Gaius Trebonius (siege) Decimus Brutus (naval blockade) | L. Domitius Ahenobarbus | ||||||||
| Units involved | |||||||||
| Legio XVII, XVIII and XIX | Militia of Massilia | ||||||||
| Strength | |||||||||
Land forces:c. 15,000 legionaries (3 legions)
| Land forces:c. 8,000 militia
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| Casualties and losses | |||||||||
| 1,100 killed | 4,000 killed | ||||||||
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Thesiege ofMassilia, including two naval engagements, was an episode ofCaesar's Civil War, fought in 49 BC between forces loyal to theOptimates and a detachment ofCaesar's army. The siege was conducted byGaius Trebonius, one of Caesar's seniorlegates, while the naval operations were in the capable hands ofDecimus Brutus, Caesar's naval expert.
Lucius Domitius Ahenobarbus had becomeproconsul ofGaul and was sent to gain control of Massilia (modernMarseille) in order to oppose Caesar. As Caesar marched toHispania (en route toconfront Pompey's legions), the Massiliots closed their gates to him, having allied with Ahenobarbus and the Optimates. Roused by their hostile actions, he commenced a siege against Massilia, leaving the newly raised XVII, XVIII, and XIX legions to conduct the siege under the command of Gaius Trebonius. He also placed Decimus Brutus in charge of his fleet there. Caesar himself marched with his veteran legions to Hispania to fight the Pompeian generalsLucius Afranius andMarcus Petreius. He would return to the siege of Massilia after defeating his opponents at the battle of Ilerda.
After the siege had begun, Ahenobarbus arrived in Massilia to defend it against the Caesarian forces. In late June, Caesar's ships, although they were less skilfully built than those of the Massiliots and outnumbered, were victorious in the ensuing naval battle.
Gaius Trebonius conducted the siege using a variety of siege machines includingsiege towers, a siege-ramp, and a "testudo-ram".Gaius Scribonius Curio, careless in adequately guarding theSicilian Straits, allowedLucius Nasidius to bring more ships to the aid of Ahenobarbus. He fought asecond naval battle with Decimus Brutus in early September, but withdrew defeated and sailed for Hispania.
Trebonius built a stationary tower, 30 feet (9.1 m) square and six stories in height, under the very walls of the city and in the face of a rain of missiles from its engines. The walls of the tower were of brickwork 5 feet (1.5 m) thick. When the lowest storey was built it was covered with a solid fireproof roof which was not secured to the walls but rested upon them like a lid. The eaves projectedconsiderably, and from them screens were hung on all sides, covering all the walls. By means of screws the whole canopy, roof, and screens was now raised to the height of one storey and the workmen proceeded to build thewalls of that storey under its protection. This process was repeated in the samemanner until the full height of the tower was attained.[1]
The Massiliots valiantly defended against the siege machines and works. They threw downburning pitch and pine-shavings and the Caesarians undermined the foundations of their city walls. At one point they seemed likely to surrender and declare a truce, but at night they cunningly destroyed the siege works in a gross violation of the treaty, according to Caesar's own account (Bellum Civile 2.14; alternatively,Dio 41.25.2 records that the Massiliots destroyed these works in response to a surprise attack by the Caesarian forces). The city's inhabitants were then near surrender.
At the final surrender of Massilia, Caesar showed his usual leniency and Lucius Ahenobarbus fled to Thessaly in the only vessel that was able to escape from thePopulares. Afterwards, Massilia was allowed to keep nominal autonomy, due to ancient ties of friendship and support of Rome, along with some territories while most of its empire was confiscated by Julius Caesar.
