Key Facts
- Dates
- 17–27 June 1812
- French garrison strength
- 800 men
- Allied besieging army
- 48,000 men
- French relief force
- 40,000 men under Marmont
- Duration
- 10 days
Strategic Narrative Overview
Wellington's 48,000-strong force invested the three fortified convents on 17 June 1812, but insufficient artillery ammunition slowed proceedings. Marmont marched a 40,000-man relief army but could not break the Allied cordon. A premature British storm on 23 June was repulsed by the 800-man garrison under Lieutenant Colonel Duchemin. Sustained artillery fire eventually breached one fort and set another ablaze, compelling the garrison to surrender on 27 June after ten days of resistance.
01 / The Origins
During the Peninsular War, Wellington's Allied army advanced into Spain in mid-1812 seeking to exploit French strategic overextension. Salamanca held three convents converted into fortified strongpoints by the French, blocking a clean Allied occupation of the city. Reducing these forts was a prerequisite for Wellington's broader offensive campaign against Marshal Marmont's Army of Portugal, making the siege a necessary preliminary operation before any major maneuver could proceed.
03 / The Outcome
The French garrison surrendered on 27 June 1812, clearing Salamanca for Allied use. Marmont's failed relief attempt left him with the mistaken belief that Wellington would only act defensively. This misjudgment proved fatal a month later: Marmont overextended his army and was decisively defeated at the Battle of Salamanca on 22 July 1812, a victory that opened the road to Madrid for Wellington.
Belligerents & Mobilization Analysis
Side A
1 belligerent
Arthur Wellesley, Lord Wellington.
Side B
1 belligerent
Lieutenant Colonel Duchemin, Marshal Auguste de Marmont.
Kinetic Engagement Axis
Scroll horizontally to view full axis. Events plotted relatively.