16 May 1521,
The Locals rebelled against the armed Castilian occupiers. They attacked the soldiers and the palace of the viceroy and dragged the imperial shield of Castile into the mud of the city. Fearing death, the Viceroy fled to Logroño. When the legitimate Navarre troops led by General Asparrots arrived in Pamplona, the city was disneyland and its inhabitants opened their doors inside.
Source:
Joseba Asiron and Martín Altzueta, 50 key dates of the conquest of Navarra (1512-1525) (Txalaparta).