On 10 January 49 BC, Julius Caesar crossed the Rubicon River, a decision that would trigger civil war and reshape the Roman world. But what did this moment really mean, and how inevitable was the conflict that followed? In this episode of the Ancient Warfare Podcast, the team explore the political and military background to Caesar's fateful decision. We look at the breakdown of relations between Caesar and Pompey, the pressures within the Roman Republic, and why compromise ultimately failed. Was Caesar forced into action, or did he deliberately choose war? The discussion goes beyond the famous phrase and the dramatic image of a single river crossing. We examine the military realities Caesar faced, the loyalties of his legions, Pompey's strategic position, and how contemporaries understood the step Caesar had taken. Finally, we consider how the crossing of the Rubicon has been remembered, mythologised, and misunderstood ever since. Join us on Patreon patreon.com/ancientwarfarepodcast