Marquis was préfet maritime of Toulon, and as such, responsible for the administration of the city. He was captured by the Germans in the wake of their attempt to capture the French fleet, but his assistant managed to warn other officers and transmit the order to scuttle the fleet.
At the Liberation, he was tried for treason, failure to save his fleet, and failing to deliver his fleet to the Allies, and indignité nationale.
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