To protect British interests, a naval squadron under Commander William Glascock in HMS Orestes was stationed in the Douro, where it came under fire from both sides.
After receiving a military education in England, Guyon fought against Dom Miguel in the Liberal Wars in Portugal.
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When during Portugal's Liberal Wars his stepfather was appointed Admiral of the navy of Dom Pedro, he accompanied him as aide-de-camp, with the temporary rank of Captain, and distinguished himself by his bravery in the fourth Battle of Cape St. Vincent (1833) in which the navy of Dom Miguel was resoundingly defeated.
The Integralismo Lusitano movement rallied all monarchist movements behind the descendents of Miguel (who was exiled after the Liberal Wars).
Over the next 25 years the fledgling Portuguese democracy experienced several military upheavals, especially the Liberal Wars fought between the brothers Dom Pedro, ex-Emperor of Brazil and the absolutist usurper Dom Miguel.
While in Paris, he was invited to accompany Peter IV during his campaign to return Portugal to a liberal monarchy, and departed on 25 January 1832 for Terceira, from Belle-Isle.