Battle of Munda (45 BC): The Last Battle of Caesar's Civil War

The Battle of Munda was fought on 17 March 45 BC in southern Spain between Julius Caesar and the last Pompeian army, led by Pompey’s sons Gnaeus and Sextus and by Titus Labienus. It was the hardest of Caesar’s civil war battles and ended in a crushing victory for him. Munda closed the civil war that had begun when Caesar crossed the Rubicon four years earlier.

Background: a new war in Spain

Spain had long been a Pompeian stronghold, since Pompey had campaigned and built a network of supporters there. In 48 and 47 BC the harsh rule of Caesar’s governor Quintus Cassius Longinus provoked mutinies and revolts among troops and provincials in Further Spain.

After the Pompeian defeat at the Battle of Thapsus in April 46 BC, survivors reached Spain. Pompey’s elder son, Gnaeus Pompeius, took command, joined by his brother Sextus and by Labienus, Caesar’s former second-in-command in Gaul. They raised thirteen legions, a mixture of former Pompeian veterans, deserters and fresh recruits from the province.

Caesar’s officers in Spain could not contain the rising, and at the end of 46 BC Caesar himself left Rome. He travelled quickly overland and arrived in Spain within about a month.

The winter campaign

The early weeks of 45 BC were a hard war of sieges and manoeuvre in the valley of the Guadalquivir, the ancient Baetis. Gnaeus avoided a pitched battle while Caesar attacked Pompeian-held towns. In February Caesar captured the fortified town of Ategua after a siege, a blow to Pompeian prestige that encouraged desertions.

Both sides treated captives and townspeople harshly, and the anonymous Spanish War, written by an officer in Caesar’s army, describes a bitter conflict. Eventually Gnaeus decided to make a stand near the town of Munda, on high ground with a stream and marshy ground in front.

The battle

Caesar’s army numbered about 80 cohorts, the equivalent of eight legions, with some 8,000 cavalry, according to the Spanish War. The Pompeians had thirteen legions together with light troops and cavalry. They held the slope, and Caesar had to cross the low ground and attack uphill.

The fighting was unusually fierce. Many of the Pompeian soldiers were men who had already been pardoned once or were deserters, and they expected no mercy if they lost. For a long time neither side gave way, and Caesar’s line began to falter. Plutarch and Appian report that Caesar ran forward into the front rank to rally his troops, and Plutarch says Caesar remarked afterwards that he had often fought for victory, but at Munda he had fought for his life.

The turning point came on Caesar’s right, where the veteran Tenth Legion began to push the enemy back. Gnaeus moved a legion from his own right to strengthen that wing. At the same time, the cavalry of Caesar’s ally King Bogud of Mauretania threatened the Pompeian camp. Labienus led five cohorts away to protect it. The Pompeian soldiers took the movement for a retreat, and their line broke.

Losses and aftermath

The Spanish War claims about 30,000 Pompeian dead against some 1,000 Caesarian dead and 500 wounded. Like most ancient casualty figures these are uncertain, but the Pompeian army was destroyed. Labienus was killed, along with the Pompeian officer Publius Attius Varus. The survivors took refuge in the town of Munda, which Caesar’s troops besieged and took.

Gnaeus Pompeius fled towards the coast and was hunted down near Lauro, where he was killed in April 45 BC; his head was brought to Hispalis (Seville). Sextus Pompey escaped. He later built a powerful fleet based on Sicily and remained a force in Roman politics until his defeat at Naulochus in 36 BC.

Caesar spent several months reorganising Spain. The young Octavian, his great-nephew and future heir, travelled to Spain to join him after the battle. Caesar returned to Rome and in October 45 BC celebrated a triumph over Spain, which offended many Romans because it celebrated a victory over fellow citizens.

Consequences

Munda left Caesar without serious military opponents. In early 44 BC he was named dictator for life. Fear that he intended to rule permanently led to his assassination on 15 March 44 BC, just under a year after Munda. The power struggle that followed produced the Second Triumvirate of Octavian, Mark Antony and Lepidus.

Timeline

• 46 BC, April: Pompeian survivors flee to Spain after Thapsus.
• 46 BC, late: Caesar leaves Rome for Spain.
• 45 BC, February: Caesar captures Ategua.
• 45 BC, 17 March: Caesar defeats the Pompeians at Munda; Labienus is killed.
• 45 BC, April: Gnaeus Pompeius is caught and killed near Lauro.
• 45 BC, October: Caesar celebrates a triumph over Spain in Rome.
• 44 BC, 15 March: Caesar is assassinated in Rome.

Why it matters

Munda was the last battle of Caesar’s civil war and confirmed him as the sole master of the Roman world. Yet the victory over fellow Romans also deepened resentment of his power, and within a year it was followed by his murder and a new round of civil wars.