Military history of ancient Rome

• 1. Introduction

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  The military history of ancient Rome cannot be separated from its politics. From an early date that politics rested on competition inside the ruling elite. Each year two consuls were elected to head the government of the state. In the early to mid-Republic, each consul was handed a consular army and a region in which to campaign. So the question of who commanded soldiers and who steered the state were, from the start, the same question. That entanglement would eventually decide the fate of the Republic itself. Over the roughly thirteen centuries that the Roman state existed, its armies fought their way from a cluster of Italian towns to dominance over the lands around the Mediterranean Sea. How did a system built on yearly elected commanders end up producing armies loyal to individuals rather than the state? And what did Rome build, technologically and structurally, to win those wars? The answers run from sticks and stones to siege engines, and from tribal skirmishes to a third-century crisis that nearly ended everything.

• 2. From Consuls To Generals

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  Gaius Marius and Sulla mark the turn. From them onward, control of the army began to be tied to the political ambitions of individuals rather than to the office a man held for a single year. That shift did not stay contained. It fed directly into the political triumvirate of the 1st century BC, an arrangement in which command and ambition reinforced each other. The triumvirate resolved itself in a civil war. That war, in turn, brought the collapse of the Republic. The phrase the source uses for this whole arc is blunt: from subjects of the state to subjects of the general. A soldier who had once served Rome now served the man who paid and led him. The Empire that followed inherited this problem rather than solving it. It was increasingly plagued by usurpations led or supported by military conspiracies, a pattern that would build toward the gravest crisis of all.

• 3. Army, Navy, And Empire's Reach

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  At the highest level, the Roman military split into two branches: the Roman army and the Roman navy. Within each branch, the actual structure was subject to substantial change throughout its history, so there is no single fixed shape to describe. The core of Rome's campaigns is the story of its land battles. Those battles began against tribal neighbors and Etruscan towns within Italy. From that conquest of Italy, the reach extended outward until Rome came to dominate much of the land surrounding the Mediterranean Sea. At the Empire's height, that dominion included the provinces of Britannia and Asia Minor. Naval battles mattered less by comparison, though there were notable exceptions. The First Punic War is the example the source singles out, a conflict where fighting at sea took on real weight. The land war, however, never stopped, eventually pitting Rome against the Huns and against invading Germanic peoples.

• 4. Sticks To Quinqueremes

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  From sticks and stones to ballistae and quinqueremes. That single line captures the technological history of the Roman military as a span between two extremes. At one end sit the crudest weapons available to any early people. At the other stand the ballista, a torsion-powered artillery engine, and the quinquereme, a large oared warship. The siege belongs to this same story of applied force, a separate topic in the military history of ancient Rome. The distance between a thrown stone and a quinquereme is the distance the Roman state itself traveled across those thirteen centuries, and the same conspiracies that built toward the Crisis of the Third Century, dated by the source to 235 to 284 AD, would test whether that technology and that army could hold the late empire together.