*Pharsalus, 48 B. C.* During Caesar's Spanish campaign Pompey had gathered a large force in Macedonia, nine Roman legions reinforced by contingents from the Roman allies. His fleet, recruited largely from the maritime cities in the East, commanded the Adriatic. Nevertheless, at the opening of winter (Nov. 49 B. C.) Caesar effected a landing on the coast of Epirus with part of his army and seized Apollonia. However, Pompey arrived from Macedonia in time to save Dyrrhachium. Throughout the winter the two armies remained inactive, but Pompey's fleet prevented Caesar from receiving reinforcements until the spring of 48 B. C., when Marcus Antonius effected a crossing with another detachment. As Caesar's troops began to suffer from shortage of supplies he was forced to take the offensive and tried to blockade Pompey's larger force in Dyrrhachium. However, the attempt failed, his lines of investment were broken, and he withdrew to Thessaly. Thither he was followed by Pompey, who suffered himself to be influenced by the overconfident senators to risk a battle. Near the town of Old Pharsalus he attacked Caesar but was defeated and his army dispersed. He himself sought refuge in Egypt and there he was put to death by order of the king whose father he had protected in the days of his power. Pompey's great weakness was that his resolution did not match his ambition. His ambition led him to seek a position incompatible with the constitution; but his lack of resolution did not permit him to overthrow the constitution. The Optimates had sided with him only because they held him less dangerous than Caesar and had he been victorious they would have sought to compass his downfall.
*Caesar in the East, 48-47 B. C.* After Pharsalus Caesar had set out in pursuit of Pompey, but arrived in Egypt after the murder of his foe. His ever pressing need of money probably induced Caesar to intervene as arbiter in the name of Rome in the dynastic struggle then raging in Egypt between the twenty-year-old Cleopatra and her thirteen-year-old brother, Ptolemy XIV Dionysus, who was also, following the Egyptian custom, her husband. Caesar got the young king in his power and brought back Cleopatra, whom the people of Alexandria had driven out. Angered thereat, and resenting his exactions, the Alexandrians rose in arms and from October, 48, to March, 47 B. C., besieged Caesar in the royal quarter of the city. Having but few troops with him Caesar was in dire straits and was only able to maintain himself through his control of the sea which enabled him to eventually receive reinforcements. His relief was effected by a force raised by Mithradates of Pergamon who invaded Egypt from Syria. In co-operation with him Caesar defeated the Egyptians in battle; Ptolemy Dionysus perished in flight; and Alexandria submitted. Cleopatra was married to a still younger brother and put in possession of the kingdom of Egypt. Caesar had succumbed to the charms of the Egyptian queen and tarried in her company for the rest of the winter. He was called away to face a new danger in Pharnaces, son of Mithradates Eupator, who had taken advantage of the civil war to recover Pontus and overrun Lesser Armenia, Cappadocia and Bithynia. Hastening through Syria Caesar entered Pontus and defeated Pharnaces at Zela. After settling affairs in Asia Minor he proceeded with all speed to the West, where his presence was urgently needed.