Roman estimates of casualties at the Battle of Cannae in 216 BCE, up to 70,000 deaths in a single afternoon, make it as great a bloodbath as Gettysburg or the first day of the Somme, maybe even greater. And, almost equally fearsome in the Roman imagination, in the 70s BCE a scratch force of ex-gladiators and runaways, under the command of Spartacus, proved more than a match for some ill-trained legions. The Romans were never as invincible in battle as we tend to assume, or as they liked to make out. In 63 BCE, however, they faced the enemy within, a terrorist plot at the heart of the Roman
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