"That's right, your guess is quite reasonable. For Boudica, who was already defeated, it's better to destroy these things than to let them fall into the hands of the Romans." Leonard recalled the historical records and spoke to Joan.
After all, Queen Boudica had been fighting the Ancient Romans her entire life, so it's normal for her to make a decision to burn her bridges in the end.
This also explains why the things they found on the mountaintop were broken fragments deliberately destroyed by someone because Queen Boudica did not want her belongings to be captured.
At that moment, Leonard suddenly realized there were several new cards in his mind, proving that his previous guess was completely correct – this place was indeed the battlefield of the decisive battle that determined Britain's fate.