The Battle of the Crossing of the Douro: The battle, also known as the Second Battle of Oporto, that saw Sir Arthur Wellesley’s (later the Duke of Wellington) successful passage of the River Douro at Oporto in Portugal, on 12thMay 1809 during the Peninsular War, forcing Marshal Soult’s French army into headlong and disastrous retreat to Spain: John Mackenzie’s Britishbattles.com podcast.