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I'm writing about a world similar to that around the time of the Roman Empire, only they have domesticated bears and use them for warfare. I want them to be used to be able to break through enemy lines and be used in several ways, from shock troops to massive charges to demolish opposition. How would grizzly bears be trained to do this, using an ancient Roman level of technology? As bears tend to rear up when fighting, cavalry would be impractical. How else might they be used?

Edit 1: Just fixing grammar. Edit 2: Clarifying my question

I'm writing about a world similar to that around the time of the Roman Empire, only they have domesticated bears and use them for warfare. I want them to be used to be able to break through enemy lines and be used in several ways, from shock troops to massive charges to demolish opposition. How would grizzly bears be trained to do this, using an ancient Roman level of technology? As bears tend to rear up when fighting, cavalry would be impractical. How else might they be used?

I'm writing about a world similar to that around the time of the Roman Empire, only they have domesticated bears and use them for warfare. I want them to be used to be able to break through enemy lines and be used in several ways, from shock troops to massive charges to demolish opposition. How would grizzly bears be trained to do this, using an ancient Roman level of technology?

Edit 1: Just fixing grammar.

I'm writing about a world similar to that around the time of the Roman Empire, only they have domesticated bears and use them for warfare. I want them to be used to be able to break through enemy lines and be used in several ways, from shock troops to massive charges to demolish opposition. How would grizzly bears be trained to do this, using an ancient Roman level of technology? As bears tend to rear up when fighting, cavalry would be impractical. How else might they be used?

Edit 1: Just fixing grammar. Edit 2: Clarifying my question

I'm writing about a world similar to that around the time of the Roman Empire, only they have domesticated bears and use them for warfare. I want them to be used to be able to break through enemy lines and be used in several ways, from shock troops to massive charges to demolish opposition. How would grizzly bears be trained to do this, using an ancient Roman level of technology.

I'm writing about a world similar to that around the time of the Roman Empire, only they have domesticated bears and use them for warfare. I want them to be used to be able to break through enemy lines and be used in several ways, from shock troops to massive charges to demolish opposition. How would grizzly bears be trained to do this, using an ancient Roman level of technology?

Edit 1: Just fixing grammar.