In 49 BC Caesar led a single legion across the Rubicon River, sparking a civil war that would lead to the death of the Roman Republic.

While Caesar was fighting the Gallic Wars, events in Rome and beyond exacerbated the political tensions that would eventually lead to Civil War.

From 57-52 BC Caesar slowly conquered Gaul. Along the way he crossed into Germania twice and led the first Roman expedition to Britain. Finally, the last Gallic army was forced to surrender at Alesia.

After beginning his proconsulship of Cisalpine Gaul in 58 BC Caesar was asked to halt the advance of a migrating Celtic tribe. He managed to turn them around, but was immediately called to face an even deadlier threat at the banks of the Rhine River.

In 59 BC Julius Caesar served a controversial year in the consulship. He pressed for land and administrative reforms the conservative Senate opposed.

In 63 BC an embittered two-time consular candidate named Catiline conspired to overthrow the Roman government. He was stopped by Rome's greatest politician and orator, Marcus Tullius Cicero.

After clearing the Mediterranean of pirates in 67 BC Pompey was put in charge of the war with Mithridates. He promptly conquered his way to Jerusalem.

From 73-71 BC a gladiator named Spartacus led a slave revolt in southern Italy. Despite defeating the Romans on numerous occasions, the slave army was eventually defeated by Marcus Crassus (with an unsolicited assist from Pompey).

After Sulla's death two men emerged as the vanguard of Rome's new political generation: Marcus Crassus who would become Rome's richest man and Pompey the Great, who would become Rome's greatest general. In a few years these two men would join forces with Julius Caesar to form the first Triumvirate.