This work investigates the political and military justification for Caesar's decision to cross the Rubicon and initiate a civil war against the Roman Senate and Pompey. Julius Caesar, a Roman general and statesman, provides a first-hand account of the strategic maneuvers and political negotiations that defined the collapse of the Roman Republic. He utilizes his own perspective to frame his actions as necessary responses to the obstructionism of his rivals, presenting a calculated defense of his military campaign across Italy, Spain, and Greece.

Historians and classicists view this text as a primary source of immense value, though they frequently note the inherent bias in Caesar's self-serving narrative. It is widely studied as a foundational example of political propaganda and military reporting in the ancient world.