Battle of the Arapiles (Salamanca) Historical milestone · Arapiles, Campo de Salamanca, Salamanca Wellington defeated marshal Marmont on 22 July 1812 with some fifty thousand allies against as many French; French casualties were around twelve thousand five hundred and the victory opened the road to Madrid for the allies in the middle of the Peninsular War. 22 de julio de 1812 Photo: Malopez 21 (CC BY-SA 4.0) What to see and do in Arapiles