Convention of Klosterzeven
In July 1757 French forces under the Duke of Richelieu defeated the Duke of Cumberland's Army of Observation at Hastenbeck, leaving Hanover — the hereditary domain of King George II — exposed to French occupation. Cumberland fell back to the coast and on 8 September 1757 signed the Convention of Klosterzeven, agreeing to disband his army and effectively ceding the western German theatre. The convention threatened to knock out Britain's entire continental strategy at a stroke. Without a Hanoverian army in the field, Frederick the Great of Prussia would be isolated on the western front while simultaneously fighting Austria and Russia. William Pitt the Elder, who had constructed the Anglo-Prussian alliance and whose grand strategy depended on the German theatre pinning down French resources, was appalled. He persuaded George II — who was humiliated by his son's capitulation — to repudiate the convention. Pitt provided new subsidies and recalled Cumberland, replacing him with the Prussian commander Ferdinand of Brunswick, who proved far more capable. Over the following months Ferdinand reversed all the French gains, pushing Richelieu's successors back beyond the Rhine and inflicting a decisive defeat at Minden in 1759. Klosterzeven was thus a crisis that exposed the fragility of British continental engagement — the whole strategy rested on a single army that could be dispersed by one lost battle — but which ultimately strengthened it by producing a better commander and a clearer commitment of resources.
- Year: 1757 CE
- Category: Political
