Final answer:
Julius Caesar spent nine years as a military commander conquering various territories, including Gaul, where he fought against the Gauls for ten years. He captured and subdued many tribes and towns, invaded Britain, and fought against more than 4 million barbarians.
Step-by-step explanation:
Before he became dictator in Rome, Julius Caesar spent nine years as military commander, conquering various territories. During his campaigns in Gaul (modern-day France), Caesar fought against the Gauls for ten years, capturing and subduing over 400 tribes and more than 800 towns. He also invaded Britain and established a Roman territory there. In total, Caesar fought against more than 4 million barbarians, capturing 1 million and killing as many in battle.