Rome’s early Republic leaned on its legions, with no real navy to speak of—until Carthage, a sea-dominating empire, sparked the First Punic War in 264 BC. Exposed and outmatched, Rome turned the tide in 261 BC, reverse-engineering a captured Carthaginian ship to craft a fleet of quinqueremes. Armed with ingenious corvus boarding bridges, Rome's new navy stunned Carthage, and launched Rome as a Mediterranean powerhouse. How did land-locked Rome master the seas?