How did Julius Caesar start a civil war?

Answer 1

When Julius Caesar finished is conquest of Gaul, he went to the Roman province of Cisalpine Gaul, in northern Italy. As the governor of that province he was entitled to have troops there. However, he was not entitled to go to Italy, which at the time did not include the north, with a military force. The senate ordered him to disband his troops and return to Rome as a private citizens. His opponents wanted to prosecute him. Caesar, instead, crossed the River Rubicon (the boundary of Italy) with a legion and marched on Rome. This was effectively a declaration of war on the Roman state.

Answer 2

He didn't. In 53 BC He was busy putting down a rebellion in Gaul. He started the civil war in 49 BC by leading his army into Italy after the senate had ordered him to disband. This was the famous crossing of the Rubicon river which marked the boundary between Italy and Gaul.

Answer 3

On January 10, 49 BC, Julius Caesar led his army across the Rubicon River in violation of law, hence making civil war inevitable.

Answer 4

Caesar brought civil war to Rome by defying the senate and leading his army into Italy. His famous crossing of the Rubicon river began the civil war.