The Military of ancient Rome relates to the combined military forces of Ancient Rome from the founding of the city of Rome in the 8th century BC to the fall of the Western Roman Empire in the 5th century AD. Originally The Roman military consisted entirely of the Roman army, but a small navy was first added during the Samnite Wars and later significantly expanded. The Roman military was intertwined with the Roman state much more closely than in a modern Western nation. Josephus describes the Roman people as "as if born ready armed." and the Romans were for long periods prepared to engage in almost continuous warfare.
For a large part of Rome's history, the Roman state existed as an entity almost solely to support and finance the Roman military. The military's campaign history stretched over 1300 years and saw Roman armies campaigning as far East as Parthia, as far south as Africa and as far north as Britannia.
The makeup of the Roman military changed substantially over its history, from its early history as an unsalaried citizen militia to a later professional force. The equipment used by the military altered greatly in type over time with the Romans adapting to circumstance and showing a willingness to utilise the technology of their enemies, though there were very few technological improvements in weapons manufacture, like the rest of the classical world. For much of its history, the majority of Rome's forces were maintained at or beyond the limits of its territory, in order to either expand Rome's domain, or protect its existing borders.
The Battle of Cannae was a major battle of the Second Punic War, taking place on August 2, 216 BC near the town of Cannae in Apulia in southeast Italy. The army of the Carthaginian Empire under Hannibal decisively defeated a numerically superior army of the Roman Republic under command of the consulsLucius Aemilius Paullus and Gaius Terentius Varro. Following the Battle of Cannae, Capua and several other Italian city-states defected from the Roman Republic. Although the battle failed to decide the outcome of the war in favour of Carthage, it is regarded as one of the greatest tactical feats in military history and the greatest defeat of Rome.Having recovered from their previous losses at Trebia (218 BC) and Trasimene (217 BC), the Romans decided to confront Hannibal at Cannae, with roughly 87,000 Roman and Allied troops. With their right wing positioned near the Aufidus River, the Romans placed their cavalry on their flanks and massed their heavy infantry in a deeper formation than usual in the centre. Perhaps the Romans hoped to break the Carthaginian line earlier in the battle than they had at the Battle of Trebia. To counter this, Hannibal utilized the double-envelopment tactic. He drew up his least reliable infantry in the centre, with the flanks composed of Carthaginian cavalry.
Marcus Ulpius Nerva Traianus, commonly called Trajan, lived from September 18, 53 to August 9, 117. He was a Roman Emperor from 98–117. He was the second of the "Five Good Emperors of the Roman Empire". From 101-102, and then from 105-106 he launched the Dacian Wars, ending with Dacia being added to the Roman Empire as yet another province. From 113-116, he led the successful invasions of Armenia, Persia, and Mesopotamia, bringing the Empire to its greatest territorial extent. He died soon after the invasions in 117, and his adopted son Hadrian took the throne. Soon after Hadrian took the throne, he lost most of the eastern territory, yet Dacia remained a Roman province.
Roman, remember that you shall rule the nations by your authority, for this is to be your skill, to make peace the custom, to spare the conquered, and to wage war until the haughty are brought low., Virgil, Aeneid
Alea iacta est (The die is cast), reportedly said by Gaius Julius Caesar before crossing the Rubicon
Silent enim leges inter arma (Laws are silent in times of war), Cicero
War gives the right of the conquerors to impose any conditions they please upon the vanquished. , Gaius Julius Caesar
The outcome corresponds less to expectations in war than in any other case whatsoever, Livy
A bad peace is even worse than war. , Tacitus
Veni, Vidi, Vici (I came, I saw, I conquered), Gaius Julius Caesar
I found Rome brick, I left it marble., Caesar Augustus