Carrhae- Analysis and Aftermath
The battle of Carrhae was a decisive loss in the annals of Roman history. Of the confident army that crossed the Euphrates in 53 BC, 20,000 were dead, 10,000 captured, and only 5,000 made it back to tell the tale.
Many leading Romans opposed the campaign, including Cicero, who claimed it was a war without cause. This was true, as a treaty existed between the two empires. Others claimed it was a war of aggrandisement, allowing Crassus to achieve military success equal to the other Triumvirs, Pompey and Caesar. Again, this is also true. His campaign route was also criticised. His senior officers strongly suggested that the invasion should occur through Armenia to secure that nation's significant military aid. Crassus coldly rejected the offer. He likely wanted an exclusive victory. A victory reliant solely on his own merit and the subsequent glory, Crassus didn't want to share. In this regard, Crassus was no different from a class of Romans on the treadwheel of the Cursus Honorum. The act of provoking war and chasing personal fame was inbred into aristocratic Romans. Honour and accolades awaited. The Parthians were a mere vehicle for Crassus's soon-to-be Triumph in Rome. But first, he had to swat away those pesky Parthians. Of course, the Parthians had other ideas and a well-honed battle plan.
The Roman political system was built for ambitious aristocrats to obtain money and secure honour, which could only be achieved by the force of arms. In this regard, Crassus was no different from Caesar, Pompey, and many other Romans. The clamour of approbation would have vanished if Crassus had achieved a solid military result.
Crassus's worst mistake was not acquiring intelligence about his enemy. He had little knowledge of how the Parthians waged war and made no effort to rectify his mistake whilst on campaign. Crassus suffered from the belief that the Roman military system, once unleashed, was unbeatable. His gravest fault was hubris. Not acquiring crucial military information concerning your enemy is unforgivable in a commander, and Crassus would suffer accordingly. The Roman way of war consisted of set-piece infantry battles; however, the Parthians did not oblige in this instance. The Romans, unfamiliar with this type of warfare, as it consisted of cavalry archers adroitly managed, suffered accordingly. Surena showed his mastery of logistics by using camels as arrow bearers to replenish his mounted archers- the arrow barrage would continue to nightfall. The Parthians were skilled mounted archers who could shoot frontally and backwards on the feigned retreat. Although the Romans were heavily armoured and protected by the large scutum, inevitably, the arrows would find a mark. Publius' cavalry sortie was ill-considered. It was quickly surrounded and destroyed after being lured away from the main body of troops. It is telling that when Publius exhorted his cavalry to attack, his men protested, exhibiting their pierced hands and feet.
Crassus was too trusting of his native guides and failed to unearth their motivations for providing help. In fact, they had been planted by the cunning Parthians to purposely lead the Romans astray (silly Crassus). He was lured into the waterless desert, a terrain perfect for Surena's horse archers. The treacherous Arab guide, Ariamnes, also assured Crassus that the opposing Parthian army was relatively small in number and posed little threat to the mighty Roman legions. Again, during Crassus' final retreat, he was lured into unfavourable marshland by treachery.
No doubt, Crassus was a fool for not accepting Armenian help. The Armenians could supply 36,000 troops, and an invasion from Armenian territory benefited the Romans. Surena would have had difficulty enacting the battle on favourable terms due to the hilly terrain, which was totally unsuited for cavalry. Also, the Armenians knew the territory well and would have guided the Roman army along the most advantageous route into the Parthian heartland. Furthermore, the Armenians were well aware of the battle order of the Parthians and their reliance on horse archers. This knowledge would have served the Romans well and helped formulate troop dispositions. Although the Romans had encountered horse archers before, these experiences were little more than skirmishes. The battle of Carrhae was the first time a Roman army faced a massed cavalry army entirely devoted to archery.
Crassus was complacent. The Romans had previously faced off against eastern armies and generally had defeated much larger armies with relative ease. Crassus, therefore, underestimated the Parthians—a grievous fault in any general. Ultimately, his overweening confidence contributed greatly to his downfall. This is particularly puzzling as Crassus was no novice to war. Indeed, he was deemed a competent soldier and was responsible for finally ending the Third Servile War led by the legendary Sparticus. However, this victory occurred decades ago in 71 BC.
Aftermath
This was a decisive Roman defeat, and with the defeat came lost prestige. Also, seven Eagle Standards carried by the legions had been lost to the enemy, a major disgrace for Rome. The standards were finally returned in 20 BC after negotiations with the Parthians mediated by Augustus.
The Triumvirate of Crassus, Pompey, and Caesar had been a difficult political balancing act. Crassus' death changed the political dynamic, and soon, Caesar and Pompey would go to war to vie for ultimate power in Rome. The scene was set for the dreadful and debilitating Civil War of 49-45 BC. The aftermath signalled the death of Republican Rome and the introduction of Imperial Rome. In addition, Rome's ambitions in the east were curtailed, and the Parthians took advantage of the defeat by invading Rome's ally, Armenia. This placed the Parthians in a favourable position to invade Roman-held Syria. Initially, they were beaten by Cassius, he of Caesar assassination fame. Over the next two decades, Parthia invaded the Roman East at will, occupying Syria twice. The Parthian victory ended the concord between these two great empires and placed the Roman province of Syria under grave danger for decades.
Conclusion
Crassus's bid for vainglory not only ended in personal tragedy but also brought grave consequences for Rome. Rome's perceived invincibility was no more. It also precipitated the collapse of the Republican system that had served the Romans well for many centuries and hurried the arrival of one-man rule. The defeat broke the peace with the Parthian Empire, and the following incursions by the Parthians into Roman-held territory would be the source of much mischief and calamity for the Romans for years to come. Thus, Crassus' defeat had profound implications for Rome and ultimately would set the scene for great misery, death and destruction.
Footnote
Suruna, the Parthian general at Carrhae, did not survive long following his great victory. Unfortunately, he was seen as a threat to the incumbent Parthian monarch, Orodès II, and was thus unceremoniously dispatched.