7. Crossing the Rubicon
In January 49 BCE, Julius Caesar defied the Roman Senate’s directive to disband his army by leading his troops across the Rubicon River into Italy. This act of insurrection initiated a civil war, challenging the Republic’s laws and marking a decisive point of no return. For an in-depth exploration of this pivotal event, refer to the Smithsonian Magazine’s article on why Julius Caesar crossed the Rubicon. (history.com)