Spain's Bastion
Spain’s Bastion: The Siege of Cadiz and the War in Spain Anthony C. Marco
"The war continued to rage and expand as the British, Portuguese, and Spanish constantly attempted to wrest control of Iberia away from the advancing French armies. The French soon discovered at places like Cadiz, on the edge of their empire, nothing but death and defeat awaited them...."
https://smallwarsjournal.com/jrnl/art/spains-bastion-siege-cadiz-and-war-spain
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He seems to still underestimate the situation in Spain, after the frist debacles, he seems to be content to destroy the Spanish Armies, to get rid of the Brits and by that enabling Joseph to achieve a stable political situation. I am sure that Soult would have loved to destroy Moore's army, it is more a sign of weakness not doing it.