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The 2003 invasion of Iraq was not the first time in history that a western army won decisive military victories in the Middle East and then found itself bogged down in a tenacious guerilla war. As the military historian Archer Jones noted in his book, “The Art of War in the Western World”, the same fate befell Alexander the Great 2,500 years earlier. After winning decisive victories against the Persian army in two major battles, he found himself unable to defeat the tribes of northern Afghanistan:
(Alexander’s) opponents essentially followed a raiding strategy, attacking his outposts and, except for their strong points avoiding contact with large contingents of his army…they sought to avoid strong Macedonian forces, concentrating on overwhelming weak detachments and then withdrawing.
(Alexander) established and garrisoned a large number of fortified military posts throughout the settled part of the county…although the measures taken by the Macedonians strengthened the defense… they failed to prevent the guerillas raids. The invaders had too few soldiers to stop the raids in a large country in which the guerillas had political support among the population.
Alexander was the first of the great conqueror-generals of western history. But the classic description of how a war of occupation should be conducted – one that was read by every British schoolboy learning his Latin in the era of the British Empire and by every modern graduate of West Point — is Julius Caesar’s narrative of his conquest of Gaul. Caesar’s dispatches to the Roman senate about his campaigns in what is now France, Belgium and Germany provided a model that all subsequent generals sought to emulate.
Western Europe in Caesar’s time was a vast patchwork of small tribes, each controlling areas of one hundred or two hundred square miles, along with some 20 or 30 much larger cultural groups. Caesar, in contrast, had only a handful of legions under his command. But the Roman legion was a formidable fighting force that could routinely defeat Gallic armies two, three or four times its size. It was a highly trained and disciplined formation of about 5,000 men that could fight as a single cohesive unit, standing literally shoulder to shoulder, or it could quickly divide into smaller groups that could maneuver and battle independently. A Roman legion could march all day at a pace almost twice as fast as most of its opponents and then build a walled, fortified camp before the sun had set. Roman military technology was far in advance of Gallic techniques and included the ability to build river spanning bridges, catapult artillery, siege towers and vast encircling walls around resisting Gallic cities within a matter of days.
But with only four legions when he began, Caesar could not hope to control the vast region from the Italian Alps to the English Channel by sheer military force alone. The key to his strategy was a complex network of alliances with some Gallic tribes and the deliberate fomenting of conflict between others – a method the Romans called divide et impera — divide and rule.
As the leading military monograph on Caesar’s Gallic campaign notes:
(Caesar’s) task was made easier by the inability of the Gallic tribes to unite to form a combined resistance to the invaders. Indeed some tribes supported the Romans, and the Romans played one tribe off against another, exploiting the territorial ambitions of different Gallic tribes and even political divisions within tribes.
Caesar (who frequently referred to himself in the third person in his dispatches) described one such maneuver as follows:
He (Caesar) impressed upon Diviciacus the Aeduan the importance, alike for Rome and the general safety of Gaul, of preventing the junction of the various enemy contingents, in order to avoid the necessity of fighting such powerful forces at once. He explained that the best way of effecting this was for the Aedui to invade the land of the Bellovaci and start devastating it.
In fact, reading Caesar’s dispatches is almost like looking over the shoulder of a skilled chess player as he moves his pieces – legions, garrisons and allies – across a map of Western Europe, placing garrisons at strategic locations, rapidly moving troops to quell outbreaks of rebellion and negotiating a careful network of alliances and “treaties of friendship” with tribal leaders. Caesar’s readers in the Roman senate were engrossed by his descriptions of how he maintained control over such a vast territory with his relatively small force.


