The Battle of San Germano (or the Battle of Mignano) was the final battle in the Neapolitan War between an Austrian force commanded by Laval Nugent von Westmeath and the King of Naples, Joachim Murat. The battle started on 15 May 1815 and ended on 17 May, after the remaining Neapolitan force was routed at Mignano.
Following his defeat at the Battle of Tolentino, Murat had fallen back to San Germano, now Cassino. There Murat reinforced his battered army with the Army of the Interior, which had been left in reserve to defend Naples during the war. Even so, most of the original Neapolitan force had been killed, wounded or deserted, and Murat's force only totalled 15,000. Meanwhile, General Nugent's force, who had marched from Florence, arrived in Rome on 30 April. From there, he marched towards Ceprano, where there was a minor engagement with a band of local militia. After receiving word of Murat's defeat at Tolentino, Nugent moved to intercept his retreat back to Naples.
By 14 May, the Austrians were moving on Murat's position in San Germano. The following day, Murat decided to counterattack and drove back Nugent's vanguard, before attacking the entire Austrian line.
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