Britain recognized that a permanent position on Belle Île could support attacks and blockades along the French Atlantic coast. The first landing failed against prepared defences, but Pitt diverted reinforcements intended for Martinique and ordered a second attempt. That landing found high cliffs at Saint Foy which the French had treated as defence enough and therefore left unguarded. Once British forces held the ports, Keppel prevented reinforcement while supplies came ashore for the siege of Le Palais. The subsequent exchange of the island for Minorca shows why even a small coastal base could carry disproportionate strategic value.
Chapter · 3:25:24-3:31:54
Belle Île as a forward blockade base
The capture of Belle Île gave Britain a position from which to pressure the French coast and illustrates how landing, ports, and sea control reinforce each other.