I want to know the answer to the following question:
Britain sent troops to aid Portugal.  What was the result?
All the background I'm provided with is that "Eventually the Anglo-Portuguese army, aided by guerrillas and practicing a scorched earth strategy, chased the greatly reduced Franco-Spanish army back to Spain, recovering almost all the lost towns, among them the Spanish headquarters in Castelo Branco full of wounded and sick that had been left behind.". Is that enough to answer the question?
Answer: yes