No According to Plan
The ancient Roman empire had a great talent for conquering, but not all conquests went smoothly, as this interesting fact reveals. In this case, the Romans were interested in taking over a city called Themyscera, which they had already laid siege to. The next step in their plan was to dig underground to enter the city and take it over.
But the people of Themyscera were one step ahead of the Romans and had a surprise waiting for them once they went underground. To fend off the Romans, the Themyscerans released bears into the tunnels to fight the Romans for them—the perfect example of working smarter, not harder, when defending yourself against the most powerful empire of your time.