Battle of Munda - Prelude

Prelude

The conservative republicans had initially been led by Pompey, until the Battle of Pharsalus in 48 BC and Pompey's death soon afterwards. However, in April 46 BC, Caesar's forces destroyed the Pompeian army at the Battle of Thapsus.

After this, military opposition to Caesar was confined to Hispania (the Iberian Peninsula, comprising modern Spain and Portugal). During the Spring of 46 BC two legions in Hispania Ulterior, largely formed by former Pompeian veterans enrolled in Caesar’s army, had declared themselves for Gnaeus Pompeius (son of Pompey the Great) and driven out Caesar’s proconsul. Soon they were joined by the remains of the Pompeian army. These forces were commanded by the brothers Gnaeus Pompeius and Sextus (sons of Pompey) and by the talented general Titus Labienus, who had been one of the most trusted of Caesar’s generals during the Gallic wars. Using the resources of the province they were able to raise an army of three legions. These were the two original veteran legions, and one additional legion recruited from Roman citizens and local inhabitants in Hispania. They took control of almost all Hispania Ulterior, including the important Roman colonies of Italica and Corduba (the capital of the province). Caesar’s generals Quintus Fabius Maximus and Quintus Pedius did not risk a battle and remained encamped at Oculbo, about 35 miles (56 km) east of Corduba, requesting help from Caesar.

Thus, Caesar was forced to move from Rome to Hispania to deal with the Pompeius brothers. He brought two trusted veteran legions (X Equestris and V Alaudae) and some newer legions (including III Gallica and VI Ferrata), but in the main was forced to rely on the recruits already present in Hispania. Caesar covered the 1,500 miles (2,400 km) from Rome to Obulco in less than one month, arriving in early December (he immediately wrote a short poem, Iter, describing this journey). Caesar had called for his great-nephew Octavian to join him, but due to his health Octavian was only able to reach him after the conclusion of the campaign. Capitalizing on his surprise arrival Caesar was able to relieve the stronghold of Ulipia (a town which had remained loyal to him and had been unsuccessfully besieged by Gnaeus Pompeius) but was unable to take Corduba, which was defended by Sextus Pompeius. Under Labienus’ advice, Gnaeus Pompeius decided to avoid an open battle, and Caesar was forced to wage a winter campaign, while procuring food and shelter for his army. After a short siege, Caesar took the fortified city of Ategua; this was an important blow to the Pompeian confidence and morale, and some of the native allies started to desert to Caesar. Another skirmish near Soricaria on March 7 went in Caesar's favor; many Romans in the Pompeian camp began planning to defect and Gnaeus Pompeius was forced to abandon his delaying tactics and offer battle.