Entire Roman legions vanish without a trace. What happened to the Ninth Legion?

The Ninth Legion, one of Rome's most formidable military units, mysteriously disappeared. Was it annihilated in battle or did it just fade away?
The Ninth Legion, a force of about 5,000 men, was last recorded in historical documents in 108 AD. However, after that, there's no record of its existence. Some speculate they were wiped out in a battle against the Picts in Caledonia (Scotland). Others suggest they were disbanded or transferred. Despite several theories, no evidence has been found to conclusively explain their disappearance, making it one of history's greatest military mysteries.
Location: Caledonia (Scotland)
Year: 108 AD
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