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Almost every battle Julius Caesar ever fought was win or die. He was outnumbered by the Gauls in every battle, and the Gauls started adopting Roman organizational tactics after a while. And he didn't just fight a few battles with Romans, more like dozens.

At some point it's not just luck. He was a brilliant tactician and did innovative new things almost every battle.

The one battle Caesar did lose was an example of Caesars luck. Caesar only survived because Pompey (another great general) neglected (or was unable to) finish off Caesar's forces in the rout. Pompey still trapped Caesar's forces, who were sure to starve and dwindle if Pompey just waited them out. But his rich backers goaded Pompey into fighting Caesar again, a seemingly easy battle given his huge advantages in men, especially cavalry. But do or die Caesar pulled out another victory through innovative tactics, and that victory made him the ruler of Rome.