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Which side did Marseille support during the conflict between Pompey and Julius Caesar?

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View of the old port of Marseille, France, with numerous boats docked in the harbor and the city's terracotta-roofed buildings rising up a hill, topped by the Notre-Dame de la Garde basilica. — Marseille Seaside view of the Old Port of Marseille, France.

During the conflict between Pompey and Julius Caesar, Marseille chose to support Pompey’s side.1

Following this decision, the city was besieged and eventually fell to Caesar’s lieutenant, Gaius Trebonius, in 49 BCE. Despite being stripped of its dependencies as a consequence of its allegiance, Marseille was permitted to retain its status as a free city in recognition of its past services to Rome.1