At San Millán de San Zadornil, Charles Alten's Light Division mauled Antoine Louis Popon de Maucune's French division. At Osma, to the northeast, Jacques Thomas Sarrut's French division fought an inconclusive skirmish with Kenneth Howard's division before withdrawing to the southeast. San Millán de San Zadornil is located in the Province of Burgos while Osma is in Álava, Basque Country. The actions occurred during the Peninsular War, part of the wider Napoleonic Wars.