What really happened at the battle of Lugdunum, 197 AD?

These questions came via postcard from Michael in Boston.

'What really happened at the battle of Lugdunum (197 CE)? I've read that this battle might have been the largest in Roman history - do you agree?

I've also read that this battle lasted multiple days. How does that work? Did both sides retire at night and resume fighting in the morning, or was skirmishing constant throughout?'

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