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Caesar and Pompey's forces battled with one another on numerous occasions during the Fall of the Roman Republic. What is the earliest battle that is commonly accepted as the one where it became clear that Caesar's eventual victory was inevitable?

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When Caesar led his army across the Rubicon River, Pompey fled to Greece with his army and most of the Senate.

In the beginning, the advantage seemed to lie with Pompey. Not only did he command a large army, but he also controlled much of the East as well as Spain. Caesar, however, handled the situation masterfully. Finally in 48 B.C., Caesar crushed Pompey's army at Pharsalus in Greece.

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Agreed, but there were several battles afterwards - is Pompey's flight from Rome considered to be the beginning of his downfall? –  Chris Bunch Oct 11 '11 at 22:44
    
@ChrisBunch actually... read my edit. –  Dan the Man Oct 11 '11 at 22:49
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Although Caesar's crossing of the Rubicon, which marked the border of his province, was significant in that it marked the start of full on hostilities, it was by no means certain that he would be victorious. According to both Plutarch and Suetonius, Caesar had doubts in his mind as he reached the river, the latter claiming that these doubts were soothed only by the appearance of a divine apparition. Appian also wrote that Caesar had concerns, although those had more to do with the bloodshed that he might unleash, while Cassius Dio does not mention any hesitation.

Misinformation about the size of Caesar's army prompted Pompeius and many of the senators to leave Rome not long afterwards. According to Appian and Plutarch, Pompeius was forced into this action by others in spite of his military experience. Cassius Dio attributes the move to Pompeius fearing that the masses in Rome would support Caesar over him. In terms of numbers, Pompeius had a superior force and recruited further troops in the countryside. It was around this time that Labienus, Caesar's long time deputy in Gaul, switched his allegiance to Pompeius. Even if he had grown distant from Caesar and was afraid of being harmed, as Cassius Dio records, such a move would have been extremely foolish if Pompeius was already looking like a lost cause.

After consolidating power in Italy and Spain, Caesar crossed the Adriatic Sea. However, his supply lines were cut and his defeat at Dyrrachium could well have ended the war in favour of Pompeius. That this did not occur was because the Pompeius was overly cautious, and according to Caesar, fearful of an ambush, having far exceeded his expectations in the fight.

It was only at the final battle at Pharsalus that matters were decided, and even there, Caesar was in a far from solid position. He was short on supplies, only able to acquire them by forage. According to Caesar, such was the confidence in the Pompeian camp that some of its members were already allocating priesthoods and dividing the expected spoils. While Pompeius considered defeating Caesar by starvation, his overconfident subordinates persuaded him to take the field. Pompeius also outnumbered Caesar and possessed the superior cavalry. Caesar's tactics led to the rout of cavalry, however, and in response, Pompeius fled, eventually being assassinated in Egypt.

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Best answer, well explained and cited. –  astabada Jan 8 '13 at 12:59
    
@astabada It would be great if this would be similarly well referenced: en.wikipedia.org/wiki/Caesar%27s_Civil_War A key article in such a pitiful state... –  kubanczyk Jan 8 '13 at 13:54
    
@kubanczyk I did not even notice... I promise to work on it whenever I'll have time (that is next month at the earliest!) –  astabada Jan 8 '13 at 14:47
    
+1 & what's a good book to read up on the period next to perhaps Ronald Syme's The Roman Revolution? –  Drux Jan 9 '13 at 10:01
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@Drux Can't help you out with any modern literature on this period, unfortunately, as I haven't read any myself. Of the ancient sources, I found Caesar's to be the most detailed and interesting. –  lins314159 Jan 9 '13 at 23:59
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Pharsalus was the turning point. Caesar was out numbered and could easily have lost but was the better general on the day. Remember that Pompey was considered the better general between the two at the time. After that, it was a matter of time before he finished the civil war. Pompey was later assassinated in Egypt and thus never had a chance to recover from the defeat at Pharsalus.

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Assassination is a pretty hard defeat to recover from. –  Joe Aug 31 '12 at 6:56
    
@Joe: Okay, I can see how my sentence could be confusing. –  Sardathrion Aug 31 '12 at 6:59
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Here is a time line of events of the civil war between Caesar and Pompey (continued by his party after his death)

50 - Caesar enters Italy proper by crossing the Rubicon with his army

49 - Pompey evacuates Italy and arrives in Greece

  • On route to Spain, Caesar initiates a siege of Massilia, he leaves for Spain, and his subordinates successfully end the siege and win a naval battle
  • Caesar arrives in Spain where he gains a victory over Pompeian forces at Ilerda
  • Curio, a member of Pompey's party, is defeated and killed by forces loyal to Caesar in Africa

48 - Caesar returns to Italy, crosses over to Greece, and barely wins the battle of Dyrrachium over Pompey

  • Pompey withdraws to the east, he encounters Caesar at Pharsalus in Thessaly, is defeated, flees to Egypt via boat and is murdered by order of the advisors of Ptolemy XIII
  • Caesar follows Pompey to Egypt with a small force, while sending the bulk of his army to follow via Greece -> Asia Minor -> Levant
  • Caesar backs Cleopatra VII in a civil war against her brother/husband Ptolemy XIII and is involved in street fighting in Alexandria from which he barely emerges victorious
  • Pharnaces II of Pontus, a supporter of Pompey, defeats Gnaeus Domitius Calvinus, a supporter of Caesar, at Nicopolis in Asia Minor

47 - After being reinforced by his ally Mithridates of Pergamum, Caesar, along with Cleopatra's forces, defeat her brother outside of Alexandria (Battle of the Nile), thereby ending the Egyptian phase of the war

  • Caesar gathers his forces, marches north and defeats Pharnaces at Zela in Asia Minor (at which time, Caesar allegedly declares, "veni, vidi, vici")
  • Caesar returns to Italy, suppresses a revolt in Campania, then sails to Africa

46 - Caesar barely defeats his former lieutenant and current Pompeian, Titus Labienus at Ruspina in north Africa

  • Caesar wins the major battle of Thapsus, in north Africa, against the largest remaining remnants of Pompey's party
  • Caesar travels to Spain

45 - Caesar defeats the last pocket of Pompeian resistance at Munda in Spain. However, one of Pompey's sons, Sextus, escapes to Sicily where he builds up a base of power and resists Antony and Octavian until 35, when he was captured and killed in Miletus

Sources:

  1. From the Gracchi to Nero - by H. H. Scullard

  2. http://www.livius.org/

  3. Wikipedia

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Which one do you consider to be the pivotal one? –  American Luke Sep 18 '12 at 1:16
    
Very good answer too. –  astabada Jan 8 '13 at 13:00
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