The Battle of Langensalza was fought on 27 June 1866 near Bad Langensalza in what is now modern Germany, between the Kingdom of Hanover (Hanoverians) and the Prussians. The Hanoverians won the battle but were then surrounded by a larger and reinforced Prussian army, and, unable to link up with their Bavarian allies to the south, they surrendered. This marked the demise of the Hanoverian Army and the annexation of Hanover into the burgeoning kingdom of Prussia as it systematically unified Germany into the modern nation state.