Should I play the "Raven and the Cuckoo" before starting or after finishing Mirage

I am close to complete my playthrough of Valhalla (only one last DLC to tackle - Siege of Paris) before playing Mirage and was wondering when to play that very last mission that is supposed to act as a bridge between Valhalla and Mirage.

Unless I am wrong, chronoligically speaking, Mirage takes place before Valhally, correct ? Therefore, should the "Raven and the Cuckoo" mission be played after completing Mirage ?

Thanks for the answer.