The Battle of Minden was a major engagement during the Seven Years' War, fought on 1 August 1759. An Anglo-German army under the overall command of Field Marshal Ferdinand of Brunswick defeated a French army commanded by Marshal of France, Marquis de Contades. Two years previously, the French had launched a successful invasion of Hanover and attempted to impose an unpopular treaty of peace upon the allied nations of Britain, Hanover and Prussia. After a Prussian victory at Rossbach, and under pressure from Frederick the Great and William Pitt, King George II disavowed the treaty. In 1758, the allies launched a counter-offensive against the French forces and drove them back across the Rhine.