I had to check the location, hence the map below.



Wiki also points out that "all was not well":
During the Peninsular War, the Aragonese capital was the site of two fierce sieges. During the siege in 1808, the Spanish under General Palafox defeated a superior French force. In 1809, during a particularly bloody siege, the Spaniards were overwhelmed by superior enemy forces. Almost 30,000 of the garrison and citizens of Zaragoza (from a total of 32,000) perished rather than surrender the city. Two weeks after they breached the walls, the French were still forced to fight for each house, square, church and convent.
Link:http://en.wikipedia.org/wiki/Aragon

The early period of the Peninsular War in Spain is very interesting, in part due to the early French success, using treachery and coup d'main. As illustrated by this passage:
Under the pretext of reinforcing the Franco-Spanish army occupying Portugal, French imperial troops entered Spain, where they were greeted with enthusiasm by the populace despite growing diplomatic unease. In February 1808, Napoleon turned on his ally and ordered French commanders to seize key Spanish fortresses.
Or some planning to invade and reduce beforehand the 100k Spanish army:
15,000 of its finest troops—Pedro Caro, 3rd Marquis of la Romana's Division of the North—had been lent to Napoleon in 1807 and remained stationed in Denmark under French command.
From a lengthy, detailed Wiki:http://en.wikipedia.org/wiki/Peninsular_War

Napoleon decided as the Peninsular War came to an end, with the Anglo-Portuguese army on the French frontier (Bay of Biscay end), to retain a large garrison @ Pamplona, to secure a point of re-entry! I have friends preparing to visit the city and region this year, to inspect the fortifications.