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Roman Combat Mechanics

Mike Anderson By Mike Anderson Published on December 20, 2015

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This article owes much to Professor Philip Sabin, author of the article The Face of Roman Battle, published in The Journal of Roman Studies, Volume 90 (2000). Dr. Sabin is Professor of Strategic Studies in the War Studies Department at Kings College, London.

Sabin asserts that there are four areas of study that are required to understand the mechanics of ancient battles: duration, casualties, mobility during the battle, and the role played by the supporting ranks located behind the front lines.

We know that the duration of ancient battles ran from short to long depending on the circumstances. Occasionally the adversary ran away before the first blow was struck. Other battles have been known to last all day. So how long was the average battle? Livy cites battles lasting many hours; Caesar described a battle of several cohorts lasting five hours. The data we can put our hands on suggests a couple of hours on average. Of course the interval is not just sword play but includes maneuvers during the battle, such as the re-positioning of cavalry.

The second area is casualties. Data shows that casualties, among armies Rome defeated, amounted to about 50%. This contrasts with the figure for hoplite battles which ran about 14%. The difference is explained by pursuit which occurred more often in Roman times. One has a hard time imaging a hoplite phalanx dragging their heavy shields in pursuit of a retreating enemy. The Romans, however, made a practice of it. When Rome was a victor, it lost about 5% of its force, although there was the occasional “Pyrrhic victory”, so the typical Roman battle had low or high casualties on each side until the rout when the losing side’s casualties accelerated.

A third factor in battle is mobility. Opposing forces would advance or give ground depending on the circumstances. We have the famous story of the ordered Carthaginian pull back at Cannae creating a “crescent” for the Romans to advance into. Caesar cited a case where the Helvetii fell back a mile before resuming their resistance from a higher position. In sum, mobility had the impact of influencing battle conditions depending on the terrain or composition of the armies. Beyond the efforts of the infantry, the impact of cavalry as the most mobile force in an army and its ability to turn the tide of battle, is also well documented.

The fourth factor in battle is the role played by auxiliary services. The Roman alternative to the deep hoplite formation was to advance in the familiar lines we’ve read about. The purpose of this structure was to make reinforcements available to relieve the tired troops on the front line. This has been clearly stated by Livy and others. We’ve all seen the checkerboard manipular formation with gaps a maniple wide in between the units leading to the gaps being filled where necessary, but it’s never been clear from the history how the Romans were able to maneuver fresh troops into position during battle. Gaps are required to position the fresh troops and they have to get into position to replace the tired ones. Let me suggest how this could have been done.

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Creating space by forcing a bulge in the enemy line allows fresh troops to slide in front of those pulling back.

Taking all the above factors into consideration, one can see why the Roman army was superior for so long: professional well-trained soldiers, disciplined, with the mobility to bring fresh troops to the line of battle. A formula for success.

Let us now move on to consider the close-in combat at the front line. What was happening at the point of attack? One calls to mind the othismos, the term that refers to the pushing that occurred when two phalanxes encountered each other. There has been much debate about this; how much pushing took place and what it accomplished during battle. The Romans did not fight this way. Their shields were not designed to use as a battering ram and the notion of a unified force pushing on the line would contradict the Roman design for mobility and flexibility. Caesar once commanded his maniples to spread out and make fighting room – opposite of what he would say if a concentrated force was his aim.

The “Hollywood” view of Roman battles shows a charge into contact and then a series of one on one sword fights. This is as hard to imagine as the othismos. Soldiers engaged in one on one combat sacrifice protection from their comrades and leave themselves open to attacks from the rear, not to mention the whole notion of tight Roman discipline going out the window. If only the front lines fought, with those behind providing backup, how did the spacing work? Polybius asserted that each legionnaire had six feet laterally to work with, which allowed the men behind him to fill the gap when necessary.

But this is as unsatisfactory as the othismos because of the fatigue factor. How could the front lines of two armies stand toe to toe and fight for hours?

Adrian Goldsworthy, author of the book The Complete Roman Army has some interesting ideas about this. He first argues that three quarters of the front line was fighting defensively to stay alive as opposed to attacking. This notion has been verified by examples from World War II where the majority of troops in a firefight did not fire their weapons. Secondly, Goldsworthy postulates that there were lulls in the fighting where the opponents drew back and rested. Makes sense to me. Drawing back also created an opportunity to launch pila at the enemy. We have evidence of front line soldiers killed by thrown missiles after the opponents made contact.

So we now have an idea how the Roman fighting machine may have functioned, at least to the extent a little extrapolating of the history can help us get to the truth. As the empire aged, it army degraded because it soldiers were not Roman, its discipline was lacking, and its objectives less understood by its leaders.

I have a PhD in Information Science and work in the technology industry, although I have also done academic work in history and philosophy. My avocation and true passion is the study of the ... Show More

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