Final answer:
The Roman Empire was known for its brutality and warlike ways, regularly conquering new territories and committing acts of extreme cruelty. They also employed advanced military tactics and espionage to achieve their objectives.
Step-by-step explanation:
The empire known for its brutality and warlike ways is the Roman Empire. During the republic period, Rome had a reputation for extreme militarism and wanton cruelty. They would regularly conquer new territories, slaughtering and enslaving the civilians, and in some cases even wiping out entire populations. They also used advanced military tactics, such as heavy cavalry and Greek Fire, and employed spies and agents to disrupt or start wars.