Joining the Royal Artillery, Montresor is said to have been present at the 1727 siege of Gibraltar, but more credible accounts place him in Minorca, as a matross.
Over the course of its history, the Rock of Gibraltar has changed hands many times, among Spanish, Moorish, and British hands, although it has been consistently under British control since the Treaty of Utrecht in 1713.
For much of Gibraltar's history as a British territory, its economy relied on its dual status as a key British military base and a trading entrepôt at the entrance to the Mediterranean Sea.
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Cadalso was killed at the Great Siege of Gibraltar, on 27 February 1782, just 15 days after being promoted to Colonel.
His works - mainly watercolours - verged on the naive, but have great charm and document an interesting period in the history of Gibraltar.