XEE4113730 The Knight Roland has Roncesvalaux sounding the olive. Roland, driving the rear guard of Charlemagne\'s army, was surprised by the Vascons on 15 August 778. He then sounded his horn, too late for the king to assist him. Chromolithography of the Series ??????Patriotic Education through Image?????? by French School, (19th century); Private Collection; (add.info.: The Knight Roland has Roncesvalaux sounding the olive. Roland, driving the rear guard of Charlemagne\'s army, was surprised by the Vascons on 15 August 778. He then sounded his horn, too late for the king to assist him. Chromolithography of the Series ??????Patriotic Education through Image??????); Stefano Bianchetti.