Napoleon by way of Bethier to Joseph to Lannes, February 25, 1809. Correspondence in the AN. It began with a full-dress victory parade into Zaragoza, hen to the Pilar Basilica for the Te Deum. Jean ordered Junot to go, but he refused and left town. Mortier was there, however, and Moncey.
The contemporaneous Spanish accounts are very interesting.
And of course, Laure Junot's opium dreams decades later show her hubby as the real victor at Zaragoza.