In the present age of technology, imagining the role that such a simple element as dust played in ancient warfare can be difficult. But what we regard as a mere nuisance often helped decide victory or defeat on the battlefields and during the military campaigns of the classical era.

Ancient Rome’s greatest defeat arrived in a cloud of dust. Nearly half a millennium after the 216 b.c. Battle of Cannae, historian Lucius Annaeus Florus wrote: ‘The crafty general [Hannibal] in his observation of the open plain of that region, because of the severe sun there, and very much dust, and the wind always blowing from the east, prepared his battle line so that the Romans would have dust, sun and wind…directed against their faces while the battle raged. With the aid of the elements, Hannibal’s forces crushed their enemy.

Such a costly lesson was not to be forgotten. The first century a.d. military writer Sextus Julius Frontinus wrote of it in his Stratagems, and centuries later, in the only completely intact work to have survived on Roman military science, Flavius Vegetius Renatus reflected on the enduring importance of Hannibal’s lesson. In discussing preparation for battle, Vegetius remarked that even inexperienced generals usually know to pay attention to three things before deploying their battle lines: sun, dust, and wind. However, he added, the truly prudent commander also considers how these elements might come into play later in the day as the battle rages on. Therefore the lines should be so arranged as to keep sun, wind, and dust behind the troops and in the faces of the enemy.

Ancient literature contains many examples in which clouds of dust played a role. Dust was such a common feature of the battlefield that it often became a stock image for literary accounts of warfare. Homer’s Iliad frequently conjures the image of dust hanging heavy over the field of battle as the Greeks sought to capture Troy. Soldiers fleeing in panic raised clouds of dust, as did horses and chariots.

Rome’s greatest writer, Virgil, followed the Homeric model in his own epic nationalist tale, the Aeneid. Virgil wrote that as pious Aeneas and his fellow Trojan refugees engaged in the final conflict with the Latins, led by Turnus,

A cloud of blinding dust is rais’d around,
Labors beneath their feet the trembling
ground.

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In ancient times, and indeed throughout most of military history, the foremost importance of dust was in locating the enemy. First-century a.d. poet Marcus Annaeus Lucanus offered the following image of a cloud of dust warning Pompey the Great’s ally Domitius, at Corfinium, of the approach of Julius Caesar’s troops:

When from far the plain
Rolled up a dusty cloud, beneath whose veil
The sheen of armour glistening in the sun,
Revealed a marching host.

What literature preserved for the imagination, the ordinary foot soldier knew as a blinding, choking reality. Attention to the dust raised by troop movements, however, could mean the difference between victory and defeat — life and death. The historian par excellence of the Augustan age, Livy, offered compelling evidence. He recorded how in 306 b.c., Samnites were besieging a Roman army led by Counsel Publius Cornelius Arvina when they learned of the approach of a second enemy force, led by Counsel Quintus Marcius Tremulus. Briefly turning their backs on Cornelius, they decided to ambush the approaching troops:

Thirty thousand Samnites were killed, according to Livy, in a defeat that was to a large degree attributable to clouds of dust betraying their plans.

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