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a work by Vegetius

De re militari (Latin "Concerning Military Matters"), also Epitoma rei militaris, is a treatise by the Late Latin writer Publius Flavius Vegetius Renatus about Roman warfare and military principles as a presentation of the methods and practices in use during the height of the Roman Empire and responsible for its power. The extant text dates to the 5th century. Vegetius emphasized things such as training of soldiers as a disciplined force, orderly strategy, maintenance of supply lines and logistics, quality leadership and use of tactics and even deceit to ensure advantage over the opposition. He was concerned about selection of good soldiers and recommended hard training of at least four months before the soldier was accepted into the ranks. The leader of the army (dux) had to take care of the men under his command and keep himself informed about the movements of the enemy to gain advantage in the battle. De re militari became a military guide in the Middle Ages. Even after the introduction of gunpowder to Europe, the work was carried by general officers and their staffs as a field guide to methods. Friends and subordinates customarily presented embellished copies as gifts to leaders. It went on into the 18th and 19th centuries as a source of policy and strategy to the major states of Europe. In that sense, De re militari is a projection of Roman civilization into modern times and a continuation of its influence on its cultural descendants.

The author of De re militari was Publius Flavius Vegetius Renatus, who lived in the late 4th century and possibly the early 5th century. The name of the work has a number of variants, including Epitoma Rei Militaris, but there are other problems with accepting it at face value as the verbatim work of Vegetius. Some of the manuscripts have a note that the text was revised for the 7th time in Constantinople in the consulate of Valentinian, who must have been Valentinian III, reigning 425 455. Vegetius' dates are not known, nor are the circumstances under which the work was revised. The year 450 is taken as the latest possible time the work could have been written, assuming he did all seven revisions in just a few years. The initial date of the window is established by Vegetius' own statement that he wrote covering the time usque ad tempus divi Gratiani, "up to the time of the divine Gratian." As emperors did not become gods generally until they died, the statement sets the initial possible date (terminus post quem) at 383, the year Gratian died. If the earlier date is preferred, it is unlikely Vegetius did all seven revisions or even one of them. There is no reason to question his general authorship, however. The work is dedicated to a mysterious emperor, whose identity is unknown but whom Vegetius must have assumed to have been known to his intended readership. It may be that he wrote on behalf of military reform under the patronage of Theodosius I. In that case he would have been alive in the window 378 395, the dates of Theodosius' reign. This article adopts that point of view and assigns an approximate date of 390 to the work, which would not be, then, word for word the same as what Vegetius wrote, accounting for the title variants.

Vegetius' epitome mainly focuses on military organisation and how to react to certain occasions in war. Vegetius explains how one should fortify and organise a camp, how to train troops, how to handle undisciplined troops, how to handle a battle engagement, how to march, formation gauge, and many other useful methods of promoting organisation and valour in the legion. The treatise is carefully laid out in subsections. They are organized into four books:

The first book, headed Primus liber electionem edocet iuniorum, ex quibus locis uel quales milites probandi sint aut quibus armorum exercitiis imbuendi, explains the selection of recruits, from which places and what kinds (of men) are soldiers to be authorised and with what exercises of arms they are to be indoctrinated. Vegetius also describes in detail the organisation, training and equipment of the army of the early Empire. Portraying the military decadence of the Late Roman Empire, it is a plea for army reform.

The second book, Secundus liber ueteris militiae continet morem, ad quem pedestris institui possit exercitus, contains traditional military practices with which infantry can be created.

The fourth book, Quartus liber uniuersas machinas, quibus uel obpugnantur ciuitates uel defenduntur, enumerat; naualis quoque belli praecepta subnectit, enumerates "all the machines with which cities are besieged or defended" (chapters 1 30) and adds also the precepts of naval warfare (chapters 31 46). It contains the best description of siegecraft in the Late Roman Empire. From it, among other things, we learn details of the siege engine called the onager, which until recently was thought to have been common in medieval sieges. Vegetius is keen to stress the shortcomings of the Roman Army in his lifetime. In order to do this he eulogises the army of the early Roman Empire. In particular he stresses the high standard of the pydars and the excellence of the training and the officer corps. In reality, Vegetius probably describes an ideal rather than the reality. The Army of the early Empire was a formidable fighting force. Some argue that the army was not in its entirety quite as good as Vegetius describes. The reason given is that Vegetius says that recruits should be 5 Roman feet 10 inches tall (Epitoma 1.5), the equivalent of 172 cm. The average height of adult male skeletons buried in Italy between 500 BCE and 500 CE was 168 cm, so it would probably have been hard to meet Vegetius' height standards. But this is to misunderstand what he says, as in the same section the author is clear that height is one factor and other attributes are of equal value and make up for those who do not fit the height criteria

Heavily used in its own time, De re militari became a popular manual on warfare in the Middle Ages, especially between the 9th and 16th centuries, even if some of the information was unsuitable to later times and circumstances. N. P. Milner observes that it was "one of the most popular Latin technical works from Antiquity, rivalling the elder Pliny's Natural History in the number of surviving copies dating from before AD 1300." The early English historian Bede cites Vegetius in his prose Life of St Cuthbert. The earliest extant manuscript from England to contain Vegetius' text is Cotton Cleopatra D. I (of the 11th, possibly late 10th century). De re militari came to the forefront in the late Carolingian period through Hrabanus Maurus (d. 856), who used the text for his own manual De Procincta Romaniae Militiae, composed for Lothair II of Lotharingia (r. 855 869). Vegetius' notes about siegecraft became especially obsolete when the technology advanced and gunpowder weapons such as cannon came into widespread use. Vegetius' suggestion of a soldier's religious oath to God and to the realm might have influenced knightly practices. Still, because of the lack of literacy, as a guide it was probably accessible only to aristocracy, clergy and royalty. Machiavelli very likely read Vegetius and incorporated many of his ideas into his own The Prince. To the modern day, 226 Latin copies of the book have survived, not including translations to various other European languages. Many of them have a copious amount of personal notes on them, pointing at matters that have interested their contemporary owners. The first printed editions are ascribed to Utrecht (1473), Cologne (1476), Paris (1478), Rome (in Veteres de re mil. scriptores, 1487), and Pisa (1488). A German translation by Ludwig Hohenwang appeared at Ulm in 1475. It was translated into English, French (by Jean de Meun and others), Italian (by the Florentine judge Bono Giamboni and others), Catalan, Spanish, Czech, and Yiddish before the invention of printing. An early English version (via French) was published by Caxton in 1489. However, after the first printed editions, Vegetius' position as the premier military authority began to decline, as ancient historians such as Polybius became available. Niccolò Machiavelli attempted to address Vegetius's defects in his L'arte della Guerra (Florence, 1521), with heavy use of Polybius, Frontinus and Livy, but Justus Lipsius' accusation that he confused the institutions of diverse periods of the Roman Empire and G. Stewechius' opinion that the survival of Vegetius' work led to the loss of his named sources were more typical of the late Renaissance. While as late as the 18th century we find so eminent a soldier as Marshal Puysegur basing his own works on this acknowledged model, and the famous Prince de Ligne wrote "C'est un livre d'or". In Milner's words, Vegetius' work suffered "a long period of deepening neglect".